A motorboat takes 3 hours to travel 108 km going upstream. The return trip takes 2 hours going downstream. What is the rate of the boat in still water and what is the rate of the current?

Answers

Answer 1
recall your d = rt, distance = rate * time.

let's say the boat has a still water rate of "b", and the current has a a rate of "c", ok.... when the boat is going upstream, is not really going "b" fast, is going  slower at "b - c", due to the current going in the opposite direction.

when the boat is coming downstream, is not going "b" fast either, is going faster, is going "b + c", due to the current adding speed to it.

we know the trip up was 108 kms, thus the return trip is also 108 kms.

[tex]\bf \begin{array}{lccclll} &distance&rate&time\\ &-----&-----&-----\\ Upstream&108&b-c&3\\ Downstream&108&b+c&2 \end{array} \\\\\\ \begin{cases} 108=3(b-c)\implies \cfrac{108}{3}=b-c\implies 36+c=\boxed{b}\\\\ 108=2(b+c)\\ --------------------\\ 108=2\left(\boxed{36+c} +c \right) \end{cases} \\\\\\ \cfrac{108}{2}=36+2c\implies 54=36-2c\implies \cfrac{54-36}{2}=c[/tex]

and surely you know how much that is.

what's the boat's speed? well, 36 + c = b.

Related Questions

Which expression is the greatest common factor (GCF) of the terms of trinomial 12x^7y^9 + 6x^4y^7 - 10x^3y^5

Answers

The greatest common factor is 2. 2x^3y^5

Answer:  2.   [tex]\mathbf{2x^3y^5}[/tex]

Step-by-step explanation:

Greatest common factor of any two or more expression is the largest common expression that divides them.

The given expression : [tex]12x^7y^9 + 6x^4y^7 - 10x^3y^5[/tex]

Term 1 : [tex]12x^7y^9[/tex]

Term 2 : [tex]6x^4y^7[/tex]

Term 3: [tex]- 10x^3y^5[/tex]

Lowest power of x = 3

Thus  , The highest common power of x = [tex]x^3[/tex]   (i)

Lowest power of y = 5

The highest  common power of y =[tex]y^5[/tex] (ii)

Greatest common factor of 12, 6 , -10= 2  [Because 2 is the largest number that divides all of them]   (iii)

From (i) , (ii) , (iii) , we have

Greatest common expression : [tex]2x^3y^5[/tex]

Hence, the correct answer is 2. [tex]\mathbf{2x^3y^5}[/tex]

Which sentence best describes the independent and dependent variables in the following problem? The parking garage charges $3 for the first hour of parking and $1.45 for each additional hour.Which sentence best describes the independent and dependent variables in the following problem? The parking garage charges $3 for the first hour of parking and $1.45 for each additional hour.

Answers

The dependent variable is the additional charge applied for each hour whereas the independent variable is the charge to be applied on the first hour

The dependent variable would be $1.45 for each additional hour. The cost depends on every hour so we can't really calculate it unless we have the hours given.

$3 is independent since it's only charged on the first hour. It doesn't depend on any other information.

Which sentence best describes the independent and dependent variables in the following problem? The parking garage charges $3 for the first hour of parking and $1.45 for each additional hour.Which sentence best describes the independent and dependent variables in the following problem? The parking garage charges $3 for the first hour of parking and $1.45 for each additional hour.

The histogram shows the duration, in minutes, of movies in theaters.



What relationship between the median and mean is shown by the histogram?


A) The mean is less than the median.

B) The median is less than the mean.

C) The mean is equal to the median.

D) The median and mean cannot be compared from a histogram.

Answers

A histogram is a type of bar graph that presents the frequency of your data. In this problem, the histogram shows the frequency of movies (y-axis) with respect to the minutes of their duration (x-axis). Example, there are 2 movies that have a duration of 84-91 minutes, 4 movies having a duration of 91-98 minutes, and so on and so forth.

The mean of these data is (2+4+5+4+3+3+2+2)/8 = 3.125
The median is the middle data when the frequency is arranged from least to greatest. Thus, the median in the data set 2, 2, 2, 3, 3, 4, 4, 5 is 3. Therefore, the mean is greater than the median. 

The answer is: the median is less than the mean
mean is equal to median.

HELP PLEASE
Evaluate the expression.

r = <7, -3, -7>, v = <4, 6, -5>, w = <-5, -6, -3>

v ⋅ w

a) -41
b) <-20, -36, 15>
c) <-28, 18, -35>
d) -9

Answers

Option b is right answer because v.w means 4 x -5,6 x -6 and -5 x -3.
Note-x means multiply.

Answer:

v . w = <-20, -36, 15>

Step-by-step explanation:

r = <7, -3, -7>, v = <4, 6, -5>, w = <-5, -6, -3>

To find the dot product of vectors we multiply the numbers

We need to multiply v  and w

vectors is in the form of <x,y,z>

Multiply all the x values

4 times -5= -20

6 times -6 = -36

-5 times -3 = 15

So v . w = <-20, -36, 15>

Noel reads 90 minutes a day for six days. Tyra reads 60 minutes for eight days. what is the diffrence , in minutes , between the total amount of time Noel read and the total amount Tyra read.


A. 30

B. 40

C.60

D. 80

Answers

Noel : 90 minutes a day for 6 days....90 * 6 = 540 minutes
Tyra : 60 minutes a day for 8 days....60 * 8 = 480 minutes

difference of : 540 - 480 = 60 <==

The difference between the total reading times of Noel and Tyra is 60 minutes. Therefore, the correct option is option C.

The difference in minutes between the total time Noel read and Tyra read can be calculated by adding up the individual reading times for each and then finding the difference.

Calculate Noel's total reading time: 90 minutes/day * 6 days = 540 minutes.Calculate Tyra's total reading time: 60 minutes/day * 8 days = 480 minutes.Find the difference: 540 minutes (Noel) - 480 minutes (Tyra) = 60 minutes.

A basketball player makes 39% of her shots from the free throw line. suppose that each of her shots can be considered independent and that she takes 5 shots. let x = the number of shots that she makes. what is the standard deviation for x?

Answers

Answer: 1.09

Step-by-step explanation:

Given : A basketball player makes 39% of her shots from the free throw line.

i.e. Proportion of her shots from the free throw line: p= 0.39

We assume that each of her shots can be considered independent .

She takes 5 shots.

i.e. Number of trials : n= 5

Let x = the number of shots that she makes.

Then , the standard deviation for x will be :-

[tex]\sigma=\sqrt{np(1-p)}\\\\=\sqrt{5(0.39)(1-0.39)}\\\\=\sqrt{1.1895}=1.09064201276\approx1.09064201276\approx1.09[/tex]

Hence, the standard deviation for x= 1.09

Final answer:

The standard deviation for the number of shots made by a basketball player who has a 39% success rate and takes 5 shots is approximately 1.09 shots, calculated using the binomial distribution formula.

Explanation:

To find the standard deviation for the number of shots made by a basketball player who makes 39% of her shots, we use the concept of a binomial distribution.

Given that each shot is independent and that she takes 5 shots, with x representing the number of shots made, we can calculate the standard deviation using the formula for a binomial distribution.

The formula for the standard deviation (σ) in a binomial distribution is σ = √[n × p × (1 - p)], where n is the number of trials (in this case, 5 shots), and p is the success probability per trial (in this case, 0.39 for making a shot).

Plugging in the values, we get σ = √[5 × 0.39 × (1 - 0.39)] = √[5 × 0.39 × 0.61] = √[1.1885] ≈ 1.09 shots.

Therefore, the standard deviation for the number of shots made is approximately 1.09 shots.

Suppose we select, without looking, one marbles from a bag containing 4 red marbles and 10 green marbles.what is the probability of selecting a green marbles? cours hero

Answers

Since 10 out of 14 marbles are green, the probability of selecting a green marble is 10/14=0.714.

Similarly, the probability of selecting a red marble would be 4/14.

Answer: 0.714


The table shows how an elevator 500 feet above the ground is descending at a steady rate. Which equation represents the height, h(t), of the elevator in feet, as a function of t, the number of seconds during which it has been descending? h(t) = 5t + 500 h(t) = 5t – 500 h(t) = –5t + 500 h(t) = –5t – 500

Answers

This is the concept of algebra, given that the elevator is 500ft above the ground and it is descending at a steady rate of 5ft/sec. Then height h, at time t of the elevator movement can be modeled by the equation:
h(t)=-5t+500.
The correct answer is h(t)=-5t+500

John's goal is to have more than -7 dollars in his bank account by the end of the month. The variable d is the number of dollars in John's bank account at the end of the month. Write an inequality in terms of d that is true only if John meets his monthly goal.

Answers

d > -7. Notice that it is > and not >=, because it is more than. Curious it says -7 dollars, and not a positive value

Answer:

d > - 7

Step-by-step explanation:

Here, d represents the number of dollars in John's bank account at the end of the month.

As per statement,

In John's account,

The balance must be more than -7 dollars,

That is, Number of dollars at the end of each month > - 7 ( '>' is used for more than )

d > - 7

Which is the required inequality.

Explain how you can use place value patterns to describe how 50 and 5000 compare

Answers

The place value pattern is a system of patterns of tens in which every place value is ten times the value on its right. The place value pattern system is used to write numbers that are 10 times as much as or 1/10 of any given number. 
The place values in the pattern are: ones, tens (10*ones), hundreds (10*tens), thousands (10*hundreds),...
So, 50 = 5 tens 
       5000= 5 thousands, 0 hundreds, 0 tens, 0 ones

So, 5000 > 50

How many different three digit numbers can be written using digits 1,2,3,4,5 without any repeating digits? Thank you.

Answers

1st Method:

The 1st digit can be written in 5 ways
The 2nd digit can be written in 4 ways (since 1 already gone and no repetition)
The 3rd digit can be written in 3 ways (since 2 already gone and no repetition)

Total number of ways = 5x4x3 = 60 ways

2nd Method : Permutation  (since ORDER MATTERS) of 3 digits chosen among 5 (with no repetition)

⁵P₃ = (5!)/(5-3)! = (5!)/(2!) = 60 ways
Final answer:

We can use the principles of permutation to find out that there are 60 different three-digit numbers that could be formed using the digits 1,2,3,4,5 without repetition.

Explanation:

In order to find out how many different three-digit numbers can be formed using the digits 1,2,3,4,5 without repetition, we use the principles of permutation. Firstly, we should determine how many options we have for each digit place in the three-digit number.

There are 5 possible digits for the first place (since none has been used yet).There are 4 remaining digits for the second place.Finally, there are only 3 digits left to fill the third place.

We then multiply these options together (5 x 4 x 3) which equals to 60 different three-digit numbers.

Learn more about Permutations here:

https://brainly.com/question/23283166

#SPJ3

A ship traveled for a total of 72 miles over the course of 6 hours. Heading south, the ship traveled at an average speed of 13 miles per hour, and heading east, it traveled at an average speed of 10 miles per hour. For how many hours was the ahi heading east?

Answers

recall your d = rt, distance = rate * time

the rate going south is 13, the rate going east is 10

it took a total amount of 6hours and 72miles for the whole travel

so.. if going say hmmm South, it covered a distance of "d", then going East it covered a distance of the slack from 72 and "d", it covered "72 - d" miles

so, if going South it took "t" hours, then going East it took the slack from 6 and "t", or "6 - t" hours

thus      [tex]\bf \begin{array}{lccclll} &distance&rate&time\\ &-----&-----&-----\\ South&d&13&t\\ East&72-d&10&6-t \end{array} \\\\\\ \begin{cases} \boxed{d}=13t\\ 72-d=10(6-t)\\ ----------\\ 72-\boxed{13t}=10(6-t) \end{cases}[/tex]

solve for "t"

so, it travelled East for 6-t hours

answer this plz


14 students are surveyed about the clothes they are wearing.

8 students are wearing a t-shirt.
2 students aren't wearing jeans or a t-shirt.
3 students are wearing jeans and a t-shirt.

How many students are wearing jeans, but not a t-shirt?

2

3

4

5

Answers

The Correct Answer is B: 3 . Hope This Helps!

Answer:

its

Step-by-step explanation:

Suppose your average, after taking 4 quizzes, is 73(out of 100). What must your average be on the next 5 quizzes to increase your average to 88 out of 100?

Answers

x = average of next 5 quizzes

4 * 73 = first 4 quizzes

There will be a total of 4 +5 = 9 quizzes

Average of all quizzes = 88 = (4*73+5x)/9

 

9*88 = 9*(292 +5x)/9

792 = 292 + 5x

500 = 5x

X = 500/5 = 100

 Next 5 quizzes need to average 100


An apartment has 1026 square feet of carpeting. How much is this in square meters? Use the following conversion: 1 square meter is 10.8 square feet.

Answers

The answer to the question would be 95 square meters

How many solutions to 15x+11=8x

Answers

To get the number of solutions in the equation given we shall be required to solve the equation;
15x+11=8x
collecting like terms we get:
11=8x-15x
11=-7x dividing both sides by -7 we get:
x=-7/11
therefore we conclude that the number of solutions is one

find the solution x-4y=9 and x-y=-9

Answers

see picture for solution


Find the circumference and the area of a circle with diameter
2ft

Answers

Final answer:

The circumference of a circle with diameter 2ft is 2π ft and the area is π ft².

Explanation:

To find the circumference of a circle, you can use the formula C = πd, where C is the circumference and d is the diameter. In this case, the diameter is 2ft, so the circumference would be C = π(2) = 2π ft. To find the area of a circle, you can use the formula A = πr², where A is the area and r is the radius. Since the radius is half the diameter, the radius would be 2ft/2 = 1ft. Therefore, the area would be A = π(1)² = π ft².

Final answer:

The circumference of a circle with a diameter of 2 feet is approximately 6.28 feet, and the area is approximately 3.14 square feet using the formulas C = πd and A = πr².

Explanation:

To find the circumference and the area of a circle with a diameter of 2 feet, we can use the formulas for circumference and area. The diameter of the circle is given as 2 feet. Therefore, the radius (r) is half of the diameter, which is 1 foot.

The formula for the circumference of a circle is C = πd where C is the circumference, π (pi) is approximately 3.14159, and d is the diameter. Since the diameter (d) is 2 feet, the circumference is:

C = π × 2 feet ≈ 3.14159 × 2 feet ≈ 6.28318 feet

So the circumference is approximately 6.28 feet.

The formula for the area of a circle is A = πr² where A is the area and r is the radius of the circle. Using the radius 1 foot, we find the area as follows:

A = π × (1 foot)² ≈ 3.14159 × 1 foot × 1 foot ≈ 3.14159 square feet

So the area of the circle is approximately 3.14 square feet.

Write out the form of the partial fraction decomposition of the function (see example). do not determine the numerical values of the coefficients. (3x + 1) / (x + 1)^3(x^2 + 8)^2

Answers

[tex]\dfrac{3x+1}{(x+1)^3(x^2+8)^2}[/tex]

can be expanded as

[tex]\dfrac a{x+1}+\dfrac b{(x+1)^2}+\dfrac c{(x+1)^3}+\dfrac{dx+e}{x^2+8}+\dfrac{fx+g}{(x^2+8)^2}[/tex]

what is 475% of 9.2?

Answers

To find this, multiply 9.2 by the decimal form of the percent (4.75). The answer is 43.7
475% of 9.2 is =43.7

Plastic storage bins are designed so they can be nested. The picture shows how each one fits inside another, leaving only the top part showing. The 4 stacked 10-gallon bins shown here measure 29 inches high. The height of the stack grows at the rate of 4 inches for each added bin. Write an equation in the form y = mx + b to describe the relationship between x, the number of nested bins, and y, the height of the stack.

Answers

one may note, you kinda missed including the related pictures.

so for every added bin, the stack grows by 4 inches. rise/run, the run is 1, the rise is 4, 4/1 = m = slope

now.... in the picture not shown hehee, the 10-gallon bins, 4 of them measure up to 29 inches high.... wait a second.. I thought the rise was only 4?

well, there are 4 bins, like in this case, so the rise should be 4*4, or 16, but there are 29 inches, that means, the slack leftover is the "initial value", or y-intercept, which should be 29 - 16, or 13.

[tex]\bf slope=m=\cfrac{rise}{run}\implies \cfrac{4}{1}\implies 4 \\\\\\ y-intercept\implies 13 \\\\\\ y=mx+b\implies y=4x+13[/tex]

The ratio of the length of an airplane wing to its width is 9 to 1. If the length of a wing is 40.4 ​meters, how wide must it​ be?

Answers

[tex]\bf \textit{ratio of length to width 9:1}\implies \cfrac{length}{width}=\cfrac{9}{1}\implies \cfrac{40.4}{w}=\cfrac{9}{1}[/tex]

solve for "w".

The data set gives the number of hours it took each of the 10 students in a cooking class to master a particular technique. Which of the numbers below is the best measure of the central tendency of the data? {3, 3, 4, 4, 4, 5, 5, 5, 5, 30}

Answers

4,5. im not completely sure tho its just a guess.

for the function y=-2+5sin(pi/12)(x-2)), what is the minimum value

Answers

Assuming the function is

[tex]y=-2+5\sin\left(\dfrac\pi{12}(x-2)\right)[/tex]

recall that [tex]-1\le\sin x\le1[/tex], which means

[tex]-1\le\sin\left(\dfrac\pi{12}(x-2)\right)\le1[/tex]
[tex]\implies-5\le5\sin\left(\dfrac\pi{12}(x-2)\right)\le5[/tex]
[tex]\implies-7\le-2+5\sin\left(\dfrac\pi{12}(x-2)\right)\le3[/tex]

and so the minimum value is -7.

Answer:

-7

Step-by-step explanation:

We are given that   a function

[tex]y=-2+5 sin(\frac{\pi}{12}(x-2))[/tex]

We have to find the minimum value of y.

We know that range of sin x is [-1,1].

[tex]-1\leq sin(\frac{\pi}{12}(x-2))\leq 1[/tex]

[tex]-5\leq 5sin(\frac{\pi}{12}(x-2))\leq 5[/tex]

[tex]-5-2\leq -2+5sin(\frac{\pi}{12}(x-2))\leq 5-2[/tex]

[tex]-7\leq -2+5sin(\frac{\pi}{12}(x-2))\leq 3[/tex]

[tex]-7\leq y\leq 3[/tex]

Maximum value of y=3

Minimum value of y=-7

Hence, the minimum value of given function =-7

What is the total amount in an account that has had $35 per month added into it for 30 years and grew with an annual interest rate of 7%?

Answers

The formula of the future value of annuity ordinary is
Fv=pmt [(1+r/k)^(kn)-1)÷(r/k)]
Fv future value?
PMT monthly payment 35
R interest rate 0.07
K compounded monthly 12 because the payment is monthly
N time 30 years

Fv=35×(((1+0.07÷12)^(12×30)
−1)÷(0.07÷12))
=42,698.98

Perform the operation and reduce the answer fully.
frac{1}{12}+\frac{5}{9}
​​​

Answers

Let's do away first of the coding texts. The given formula is 1/12 + 5/9. If you want to automatically know the answer, then all you have to do is input this in a calculator and you would immediately get an answer of 23/36. But that would be too easy.

To solve this manually, you must find first the greatest common factor of the denominators. To do this, simply multiply 12×9 = 108. Now, you know that the final answer would have a denominator of 108.

1                 5               [(108/12)*1] + [(108/9)*5]
---      +      ---         =   -----------------------------------
12               9                              108

Now for the numerator, you divide the denominator, 108, to each of the addends, 12 and 9. Then, multiply it with their respective numerators. The answer would then be 69/108. Both numerator and denominator are multiples of 3, so you can simplify them further by diving each with 3. The final answer is 23/36.

Which of the following is not one of the three ways to express ratio A 3/4 B 3:4 C 3 of 4 D 3 to 4

Answers

3 of 4 is not the correct way of writing a ratio.
3 of 4 is an incorrect way of expressing a ratio.

The points A(12,7)A12,7, B(12,-3)B12,-3, C(-2,-3)C-2,-3, and D(-2,7)D-2,7 form rectangle ABCDABCD. Which point is halfway between AA and BB?

Answers

To find the midpoint of line segment AB, we find the total distance for both x and y  coordinates and then divide each answer by 2.

A (12, 7)
B (12, -3)

Mid point ([tex] \frac{12+12}{2} [/tex], [tex] \frac{7+-3}{2} [/tex])
Mid point ([tex] \frac{24}{2} [/tex], [tex] \frac{4}{2} [/tex]}
Mid point (12, 2)


At the frozen yogurt shop, a machine fills cups with 4 ounces of frozen yogurt before the customer adds the toppings. After the cups are filled, customers add as many toppings as they want without the total weight exceeding 7 ounces. Which of the following graphs represents the acceptable weights for the frozen yogurt options?

Answers

The acceptable weight is within the range of [4, 7]

So the answer will be the 3rd graph

Answer: Third graph represents the acceptable weights for the frozen yogurt options.

Step-by-step explanation:

Since we have given that

Number of ounces of frozen yogurt a machine fills cups with before the customer adds the toppings = 4

After the cups are filled, customers add as many toppings as they want without the total weight exceeding 7 ounces.

So, it means the weight should be lie between 4 ounces and 7 ounces.

So, it can be written as [4,7].

4≤ x ≤7, here, x is the weight of frozen yogurt.

So, third graph represents the acceptable weights for the frozen yogurt options.

PLEASE HELP?? EASY 5 POINTS!!! The two models shown have the same volume. Complete the equation and expression below about the volume of each figure.

Answers

Volume of Model 2:

36 in³ + 12 in³ = 48 in³

Volume of the Blue Prism in Model 1:

48 in³ - 16 in³ = 32 in³
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