A class of 28 students. the ratio of girls of 3 girls 4 boys. what is the ratio for the number of boys to total number students in the class?

Answers

Answer 1
You need to make a proportion.  Cross multiply then divide

boys          4      x
students    7      28

(4)(28) = 7x
112 = 7x
x= 16

There are 16 boys

Related Questions

When segments intersect inside a circle, what is the relationship between the angle of intersection and the intercepted arcs?

Answers

they are supplementary angles because they both would have to add up to 180

Answer:

Angle of intersection is one half of the sum of measurements of intercepted arcs.

Step-by-step explanation:

An inscribed angle is the angle formed by the intersection of two chords having a common endpoint in a circle.

Also, by the angles of Intersecting Chords Theorem,

When two chords intersect inside a circle, then the measure of the angle formed is one half of sum of the measure of the arcs intercepted by the angle and its vertical angle.

Which is the relationship between the angle of intersection and the intercepted arcs.

What is the length of the other diagonal DF?
5 cm
16 cm
21 cm
32 cm

Answers

To solve this you need to know Pythagorean theorem.

First, EG is 24, so the halfway points are 12. Knowing Pythagorean triples, you can use 5,12,13 and 12,16,20.

DF = 5+16
DF = 21

If you don't know Pythagorean triples, I have worked it out on the image attached.

Applying the Pythagorean theorem, the length of diagonal DF is: C. 21 cm.

What is the Pythagorean Theorem?

The sum of the squares of the two shorter legs of a right triangle equals the square of the length of the longest leg.

Let the point of intersection of the diagonals be O.

Diagonal FD bisects diagonal EG into equal segments EO and OG. EO = OG = 24/2 = 12 cm

Find the lengths of FO and OD using the Pythagorean theorem:

FO = √(20² - 12²) = 16 cm

OD = √(13² - 12²) = 5 cm

Length of diagonal DF = FO + OD = 16 + 5 = 21 cm.

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how many times does 28 go into 126????????

Answers

In order to know that, you need to divide 28 from 126
It would be: 126/28 = 4.5

So, your final answer is 4.5

Hope this helps!

Nam has a beginning balance of $815 in her checking account. She writes a check for $210 and has a debit transaction of $525. What is her new balance?

$125

$80

$1550

$120

Answers

The answer is 80 dollars

Write the rule for the nth term of an arithmetic sequence in which a10=46 and d=3

Answers

Final answer:

The rule for the nth term of the arithmetic sequence is given by the formula a_n = 19 + (n - 1)×3, where a1 is the first term of the sequence and d is the common difference.

Explanation:

To write the rule for the nth term of an arithmetic sequence where the 10th term a10 is 46 and the common difference d is 3, we use the formula:

an = a1 + (n - 1)d

We have that:

a10 is the 10th term of the sequence which is 46.

The common difference d is 3.

Firstly, we need to find a1, the first term of the sequence. We can use the given a10 to find a1.

a10 = a1 + (10 - 1)×3

46 = a1 + 9×3

46 = a1 + 27

a1 = 46 - 27

a1 = 19

Now we can write the rule for the nth term:

an = 19 + (n - 1)×3

This formula allows us to calculate any term in the sequence by substituting the desired term number for n.

add any three numbers of the following and answer should be 60
2 , 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46, 50, 54, 58

Answers

Hit and trial, no other way. Its all about how you see numbers, the better you see numbers the lesser iterations required to get the results. 

x+y+z=60

Fix the value of x to some random number( say 38), now we have 22 more units to be divided between  "y" and "z", so by randomly looking at numbers we can say that there are no results possible.

Choose another no. as "x"( say 30) , so we have 30 units between "y" and "z", still not able to reach conclusion. 

Choose another no as "x"(say 26), so we have 34 units between "y" and "z", still not able to sum up to 60.

SO after analyzing all probabilities, I came to conclusion that it is indeed a trap question!! and no real solution exists. 

But a smart  solution, not a mathematical is,
58+2=60, here we have used rather 3 digits(not numbers) to reach our goal.

Classify the number 0. Check all that apply.
Real
Irrational
Rational
Integer
Whole
Natural

Answers

whole
 so think of it as a interger

Mandy told Bill that she has read 16 books this year and reads 2 books each month. Bill wants to catch up to Mandy. He tracks his book reading with a table on his door. Using his table below, what month will Bill have read the same amount of books as Mandy?
Month Books
May 4
June 8
July 12

Answers

we need to write equation for both mandy and bill on how many books they read depending on how many months passed.

Mandy's equation:
16 + 2x

she starts with 16 read books and she reads 2 books each month which is in total 2*x where x is number of months

Bill's equation:
4x
because from table we can see he is reading 4 new books each month.

now we need to make those 2 equations equal to eachother and solve for x because we want to see after how many months both will read the same that is why we set them equal.

16 + 2x = 4x
16 = 2x
x = 8

That means that in december he will catch her (if i counted months correctly :) )

Which of the following expressions describes the solution set m ≥ -3?

All real numbers that are negative three or greater.

All real numbers that are greater than negative three.

All real numbers that are negative three or less.

All real numbers that are less than negative three.

Answers

،، all real numbers that are (-)or greater
m→-3,-2,-1,..

The correct expression of the solution set will be;

''All real numbers that are greater than negative three.''

What is Inequality?

A relation by which we can compare two or more mathematical expression is called an inequality.

Given that;

The solution set is,

m ≥ - 3

Now,

Here, The solution set is,

m ≥ - 3

Clearly, a number 'm' is greater than or equal to - 3.

Thus, We can formulate;

The correct expression of the solution will be;

''All real numbers that are greater than negative three.''

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A surveyor standing 67 meters from the base of the building measures the angle to the top of the building and finds it to be 36 degrees. The surveyor then measures the angle to the top of the radio tower on the building and finds it is 46 degrees. How tall is the radio tower?
my choices are: a. 11.81m , b. 20.7 m, c. 7.66 m, d. 8.81 m
Any advice or assistance is appreciated. ...?

Answers

Answer:

Option B is the correct answer.

Step-by-step explanation:

Refer the the figure below of the question given.

The height of radio tower = CD

CD = AD - AC

We have

       [tex]tan46=\frac{AD}{AB}\\\\AD=ABtan46=67tan46\\\\tan36=\frac{AC}{AB}\\\\AC=ABtan36=67tan36\\\\CD=67tan46-67tan36=20.70m[/tex]

Option B is the correct answer.

2x-3y=13 y=1/2x-7/2 as a substitution problem

Answers

y = 1/2x - 7/2
so replace y with 1/2x - 7/2 in ur other equation

2x - 3y = 13
2x - 3(1/2x - 7/2) = 13....distribute through the parenthesis
2x - 3/2x + 21/2 = 13 ...multiply entire equation by 2 to get rid of fractions
4x - 3x + 21 = 26
4x - 3x = 26 - 21...combine like terms
x = 5

2x - 3y = 13
2(5) - 3y = 13
10 - 3y = 13
-3y = 13 - 10
-3y = 3
y = -3/3
y = -1

solution is (5,-1)

olivia has $180 to buy presents for her 3 sisters and 2 nephews. she wants to spend $20 more on each sister then she spends on each nephew.

Answers

Answer:

she spends 44 dollars per sister, 24 dollars per nephew

Step-by-step explanation:

180=3(20+x)+2x

180=60+3x+2x

120=5x

x=24

x+20=44

1.) Mrs. Computer is 3 times older than her daughter, Mousy. The sum of their ages is 52> How old is Mousy?
2.)Mike is 5 years more than twice as old as Tom. The sum of their ages is 65. How old is Mike?

Answers

3x + x = 52
x = 13
.
.
(2t+5) + t = 65
t = 20. mike age = 45

On the way home from school, ross wears his 20-pound backpack and carries his 7-ounce lunchbox. how many ounces does he carry in total?

Answers

327, because there is 16 ounces in every pound. 

Answer: [tex]327[/tex] [tex]\text{ounce}[/tex]

Step-by-step explanation:

Given: On the way home from school, ross wears his [tex]20[/tex] pound backpack and carries his [tex]7[/tex] ounce lunchbox.

To Find: how many ounces does he carry in total.

Solution:

Weight of Ross's backpack [tex]=20[/tex] [tex]\text{pound}[/tex]

Weight of Ross's lunchbox [tex]=7[/tex] [tex]\text{ounce}[/tex]

Now,

As unit of weight of backpack and lunchbox is different, we need to convert it.

[tex]1[/tex] [tex]\text{pound}[/tex] [tex]=16[/tex] [tex]\text{ounce}[/tex]

Now weight of backpack is[tex]=\text{weight in pound}\times16[/tex]

                                 [tex]20\times16[/tex]

                                 [tex]320[/tex] [tex]\text{ounce}[/tex]

Total ounces carried by Ross [tex]=\text{weight of backpack}+\text{weight of lunchbox}[/tex]

                                                 [tex]320+7[/tex] [tex]\text{ounce}[/tex]

Hence Total ounce carried by Ross is [tex]320+7[/tex] [tex]\text{ounce}[/tex]

                   

what is the answer to n/5- 9= 1/5

Answers

Simplifying 7n + 6 = 4n + -9 Reorder the terms: 6 + 7n = 4n + -9 Reorder the terms: 6 + 7n = -9 + 4n Solving 6 + 7n = -9 + 4n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-4n' to each side of the equation. 6 + 7n + -4n = -9 + 4n + -4n Combine like terms: 7n + -4n = 3n 6 + 3n = -9 + 4n + -4n Combine like terms: 4n + -4n = 0 6 + 3n = -9 + 0 6 + 3n = -9 Add '-6' to each side of the equation. 6 + -6 + 3n = -9 + -6 Combine like terms: 6 + -6 = 0 0 + 3n = -9 + -6 3n = -9 + -6 Combine like terms: -9 + -6 = -15 3n = -15 Divide each side by '3'. n = -5 Simplifying n = -5

Can fractions still be considered natural, whole, integers, rational, irrational, or real numbers?

Answers

Fractions are numbers which can be represented in the form p/q, where p and q are WHOLE NUMBERS and q is not zero Rational numbers are numbers which can be represented in the form p/q where p and q are INTEGERS and q is not zero So your saying " all rational numbers are all numbers that can be represented as a fraction." is wrong....... all fractions are rational numbers but NOT ALL rational numbers are fractions..

a bag of oranges weighs 5 1/4 pounds. how much do (1 & 1/2) bags weigh
*WRITTEN ANSWER....PLZ HELP, AND TELL ME HOW YOU SOLVED IT! THANK YOU AND HAVE A FANTASTIC DAY!*

Answers

one bag is 5 1/4 pounds so you need to multiply that by 1 1/2 or 3/2 as an improper fraction

21/4 x 3/2 =63/8   change that to a proper fraction to get 7 7/8 lbs

Answer:

7 7/8 pounds

Step-by-step explanation:

Given that a bag of oranges weighs 5 1/4 pounds and you want to know how much do 1 1/2 bags weigh, the next proportion must be satisfied:

(5 1/4 pounds)/(1 bag of oranges) = (x pounds)/(1 1/2 bag of oranges)

Isolating x:

x = (5 1/4)*(1 1/2)/1

x = 7 7/8 pounds

What is 75% of 90? 67.5 6750 675 6.75

Answers

75% of 90....turn percent to decimal..." of " means multiply
0.75(90) = 67.5

To calculate 75% of 90, convert the percentage to a decimal (0.75) and multiply it with 90, resulting in 67.5.

To find 75% of 90, we can use the concept that 'percent' means 'per hundred'. The calculation involves turning the percentage into a decimal by dividing by 100 and then multiplying by the number in question. Thus, 75% can be written as 0.75 (since 75 divided by 100 equals 0.75).

Therefore, to find 75% of 90, we multiply 90 by 0.75:

0.75 × 90 = 67.5

The correct answer is 67.5, not 6750, 675, or 6.75.

A function takes in values of the ____________________ variable, called inputs, and gives back values of

the ____________________ variable, called outputs. A function takes in values of the ____________________ variable, called inputs, and gives back values of

the ____________________ variable, called outputs.

Answers

The answers the would best complete the given statement above would be independent and dependent, respectively. Here is the complete statement. A function takes in values of the independent variable, called inputs, and gives back values of the dependent variable, called outputs. Hope this answer helps. 

Describe a real world situation that would show a strong negative correlation explain your reasoning

Answers

A strong negative correlation example would be the hours spend watching TV and your grades. It shows a strong negative correlation because if you just watch TV and not study for an exam, your grades would most likely be low.

a number of apples divided into 12 baskets

Answers

You would represent the number of apples with the variable a.

So the equation for that word problem would be = a/12.

I hope you find this answer the most helpful! :)
If you had the amount of apples you were dividing into the baskets the equation would be a/12 because a would represent the amount of apple. 

-7 over -10 simplified

Answers

The negatives cancel to form a positive. The answer is [tex]\frac{7}{10}[/tex]

If 20% of all manually filed returns contain errors, and 0.05% of all electronically filed returns contain errors, how much more likely is a manual filer to make an error than an electronic filer?
a.
40,000 times more likely
b.
4,000 times more likely
c.
400 times more likely
d.
40 times more likely

Answers

ratio = % of manually filed returns that contain errors /  % of electronically filed returns that contain errors

ratio = 20% / 0.05% = 20 / 0.05 = 400


Answer: option c. 400 times more likely

Answer:

c. 400 times more likely

Step-by-step explanation:

This coordinate plane shows the shape of a hang glider. The perimeter of the glider is to be trimmed with a special material. What is the minimum length of material needed?

Answers

On x axis we will need 24 feets of material. on y axis we will need 2 times 2 feet which is 4 feet for those sides.

now there are lines that are not paralel to x and y so it is not that simple (but not hard either) to calculate lenghts. we can use formula for distance between 2 dots.

we will use dots: (12,7) and (0,2)
from that using pythagoras theorem we can see that distance is:
d = √12^2 + 5^2 = 13
Total lenght is:

2*13 + 24 + 4 = 26 + 28 = 54

X = 24 ft Of Materials

Y = 2 ft Of Distance

X = (12,7)

Y = (0,2)

Using The Pythagoras Theorem

[tex]D=\sqrt{12^{2}+5^{2}}=13[/tex]

Total lenght is:

[tex]\left[\begin{array}{ccc}3*13+24+4=26\\26+28=54\end{array}\right][/tex]

Use the Distributive Property to complete the following statement:
4(x−1)=4x−


1.
–4.
4.
–1.

Answers

Hey there! Hello!

So, lets expand this problem. The distributive property basically states that multiplying two numbers being added together is the same as multiplying the outer number by the two numbers being added individually, then adding those together. Sounds way harder than it is:

[tex]x(y+z) = xy+xz[/tex]

You can apply this to your problem like this: multiply the 4 by each term in your binomial (your two terms in parenthesis), then simplify. 

[tex]4(x-1) = 4x-(4)(-1)= 4x-(-4)[/tex]

(One thing to always remember – at least, in terms of algebra and not necessarily life – two negatives always equal a positive. This is not shown above, however, because the symbol on the end of the given problem is a subtraction sign. Your answer, in this case, is (–4), or B. Hope that clears up any confusion). 

Hope this helped you out! Feel free to ask me any questions if you need further clarification. :-)

An employee receives a weekly salary of $340 and a 6% commission on all sales.
Find the employee's earnings for a week with $660 total sales.

Answers

340+.06(sales)
340+.06(660)

$379.60
Final answer:

The employee earns a fixed salary of $340 plus a 6% commission on sales. In a week with $660 in sales, his total earnings would be $379.60.

Explanation:

The employee's weekly income is a combination of a fixed salary and a percentage of sales. His fixed salary is $340. From his sales, he earns a 6% commission. So for a week with $660 in sales, the commission would be 6/100 * 660, which equals $39.60. Adding this commission to the fixed salary: $340 + $39.6 = $379.60. So, the employee's overall earnings for the week would be $379.60.

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What is the simplified form of x + 6/3 - x + 2/3

Answers

The simplified form of the given expression x + 6/3 - x + 2/3 is 8/3 after combining like terms and simplifying the constants.

The question involves simplifying a mathematical expression.

The expression given is:

x + 6/3 - x + 2/3.

To simplify this expression, combine like terms.

Since x is present in both the first and third terms, they cancel each other out.

Next, combine the constant terms 6/3 and 2/3. This results in:

6/3 + 2/3 = (6 + 2) / 3 = 8/3

The simplified form of the expression is therefore 8/3.

Write 9 decimals with two decimal places that when rounded to the nearest tenth round to 8.7

Answers

8.65
8.66
8.67
8.68
8.69
8.70
8.71
8.72
8.73

9 decimals with two decimal places that when rounded to the nearest tenth round to 8.7 are 8.65, 8.66, 8.67, 8.68, 8.69, 8.70, 8.71, 8.72 and 8.73.

What is the rounding off numbers?

Rounding a number means the process of making a number simpler such that its value remains close to what it was. The result obtained after rounding off a number is less accurate, but easier to use. While rounding a number, we consider the place value of digits in a number.

We need to write 9 decimals with two decimal places that when rounded to the nearest tenth round to 8.7

8.65, 8.66, 8.67, 8.68, 8.69, 8.70, 8.71, 8.72 and 8.73.

Therefore, 9 decimals with two decimal places that when rounded to the nearest tenth round to 8.7 are 8.65, 8.66, 8.67, 8.68, 8.69, 8.70, 8.71, 8.72 and 8.73.

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find the nonpermissible replacement for the variable x in this expression (x^2)/(2x-4) ? find the nonpermissible replacement for the variable x in this expression (x^2)/(2x-4) ?

Answers

Final Answer:

The non-permissible replacements for the variable x in the expression (x^2)/(2x-4) are x = 0 and x = 2.

Explanation:

An expression is undefined when its denominator is equal to zero. Therefore, we need to find the values of x that make the denominator, 2x-4, equal to zero.

Solve the equation for x: 2x - 4 = 0 2x = 4 x = 2

Therefore, x = 2 is a non-permissible replacement because it makes the denominator zero.

Additionally, the expression also includes x^2 in the numerator. Since any number multiplied by zero is still zero, dividing any non-zero number by zero results in undefined. Therefore, x = 0 is also a non-permissible replacement.

In conclusion, the non-permissible replacements for the variable x in the expression (x^2)/(2x-4) are x = 0 and x = 2.

Three mathematicians are applying for a job. There are five hats, three white, two black. They’re lined up, and a hat is placed on each. The first person in line cannot see any hat; the second in line sees only the hat of the person in front of him; the third person sees only the hats of the two people in front of her. The first person to correctly figure out what color hat he has gets the job; you guess wrong and you are killed. Assume these are INTELLIGENT mathematicians, and that they will do the logically correct thing at each stage — if something can be deduced, they will figure it out.

After a long pause,the first person, who cannot see any hats, says he knows the color of his hat. What is the color, and how does he know?

Answers

If the person at the back saw two black hats, he would immediately know that he wore a white hat. He does not, so the two front hats are either black and white, or both white. The second person would know this fact! If they saw a black hat in front of them, then they would know that their hat is white. Since they do not, the hat at the front must be white. The guy at the front realises all this, and knows that his hat is white.

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