Mathematics Middle School

Describe two reasons for using a variable. Write your response using 4-5 complete sentences.


PLEASE HELP ME

Answers

Answer 1
One reason would be if you did not know the answer so you could do
4-5=x
another reason would be if the problem gave you the answer but not one of the things to get the answer
4-x=-1
not sure if that is what you want but I hope this helped

Related Questions

A 32 mb memory stick can hold up to 491 images. How many images can 7 memory sticks hold?

Answers

7 memory sticks at 32 mb can hold 491 * 7 = 3437 images.
Final answer:

To find out how many images 7 memory sticks can hold, multiply the number of images one memory stick can hold by the number of memory sticks.

Explanation:

To find out how many images 7 memory sticks can hold, we need to multiply the number of images one memory stick can hold by the number of memory sticks. In this case, each memory stick can hold 491 images, so to find out how many images 7 memory sticks can hold, we calculate:

Number of images = Number of memory sticks × Number of images per memory stick = 7 × 491 = 3437 images

Therefore, 7 memory sticks can hold 3437 images.

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If s is true and j is false, is the following true or false (~s v j) ^ (s v~ j)

Answers

s = true
~s = false
-------------
j = false
~j = true
-------------
~s = false and j = false, so,
~s v j = (false) v (false)
~s v j = false
-------------
Similarly,
s v ~j = (true) v (true)
s v ~j = true
-------------
We have 
~s v j = false
and 
s v ~j = true
which lead to this when we conjunct the two logical expressions
(~s v j) ^ (s v ~j) = (false) ^ (true)
(~s v j) ^ (s v ~j) = false
-------------
-------------
The final answer is false

On a flight New York to London an airplane travels at a constant speed. An equation relating the distance traveled in miles d to the number of hours flying t is t= 1/500d. How long will it take the airplane to travel 800 miles?

Answers

Answer:

1.6 hours or 1 hour 36 minutes

Step-by-step explanation:

We have been given an equation [tex]t=\frac{1}{500}d[/tex], where d represents distance traveled in miles and t represents time in hours.

To find the time taken by the flight to travel 800 miles, we will substitute [tex]d=800[/tex] in our given equation as:

[tex]t=\frac{1}{500}\times 800[/tex]

[tex]t=\frac{800}{500}[/tex]

[tex]t=\frac{8}{5}[/tex]

[tex]t=1.6[/tex]

1 hour equals 60 minutes.

0.6 hours = 0.6*60 minutes = 36 minutes.

Therefore, it will take the plane 1.6 hours or 1 hour 36 minutes to travel 800 miles.

Using the equation, it is found that it will take 1.6 hours for the airplane to travel 800 miles.

The equation that relates the time in hours needed to travel d miles is given by:

[tex]t = \frac{1}{500}d[/tex]

In this problem, we want the time needed to travel 800 miles, thus [tex]d = 800[/tex], and:

[tex]t = \frac{1}{500}(800) = \frac{800}{500} = 1.6[/tex]

It will take 1.6 hours for the airplane to travel 800 miles.

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Which expression is equivalent to-8+7.25-6+0.5

Answers

Final answer:

The expression equivalent to -8+7.25-6+0.5 is calculated by first adding the positive numbers to get 7.75, then adding the negative numbers to get -14, and finally combining these to get an equivalent expression of -6.25.

Explanation:

To find an expression equivalent to -8+7.25-6+0.5, you need to perform addition and subtraction operations in the order they appear because they have the same level of precedence. Adding positive and negative numbers together is simplified by combining like terms, often starting with the positive numbers for easier calculation.

First, add the positive numbers together: 7.25 + 0.5 equals 7.75. Next, add the negative numbers: -8 + (-6) equals -14. Finally, combine the sum of the positive numbers with the sum of the negative numbers: 7.75 + (-14) equals -6.25.

The equivalent expression is hence -6.25.

solve the system by graphing y=2x^2+3x+1. Y=2x+1

Answers

the solution to the system of equations by graphing is [tex]\( (0,1), (-5/2,6) \)[/tex]

The correct option is (C).

The generated image above represents a graphical solution to the system of equations given:

[tex]\[ y = 2x^2 + 3x + 1 \][/tex]

[tex]\[ y = -2x + 1 \][/tex]

However, the graph does not clearly show the exact points of intersection between the parabola and the line. To find the solutions accurately, we would typically set the two equations equal to each other and solve for [tex]\( x \)[/tex]:

[tex]\[ 2x^2 + 3x + 1 = -2x + 1 \][/tex]

Solving this equation algebraically will give us the [tex]\( x \)[/tex]-coordinates of the points of intersection. The corresponding [tex]\( y \)[/tex]-values can then be found by substituting these [tex]\( x \)[/tex]-values back into either of the original equations.

Since I cannot perform this algebraic computation at the moment, you can solve the equation using the following steps:

1. Move all terms to one side of the equation to set it to zero.

2. Solve the resulting quadratic equation, either by factoring, completing the square, or using the quadratic formula.

3. Substitute the [tex]\( x \)[/tex]-values back into one of the original equations to find the [tex]\( y \)[/tex]-values.

Therefore, the correct option that represents the solution to the system of equations by graphing is:

C. [tex]\( (0,1), (-5/2,6) \)[/tex]

complete question given below:

Solve the system by graphing. y=2x^2+3x+1 y=-2x+1

A. (1,3), (4,7)

B. (1,3), (1/2,3)

C. (0,1), (-5/2,6)

D. (-5,5), (4,-2)

Two more than four times the sum of yesterday's high temperatures in degrees Fahrenheit and 7 is equal to the current temperature in degrees Fahrenheit.
a. Write an expression for the current temperature using t as yesterday's high temperature in your expression.
b. simplify the expression
c. if yesterday's high temperature was 3 degrees Fahrenheit, what is the current temperature?

Answers

4(t + 7) + 2 <== current temp expression

4t + 28 + 2 =
4t + 30 <=== simplified

if yesterdays high temp is 3...
4t + 30 =
4(3) + 30 =
12 + 30 =
42 Fahrenheit <=== current temp

Identify the like terms.



2a, –2b, 2ab, –13ab



A.


2a, –2b, 2ab


B.


2ab, –13ab


C.


2a, 2ab


D.


2a, –2b

Answers

B.


2ab, –13ab


hope this helps

Bryce and Rachel are collecting canned goods for the local food bank. Bryce's goal is to collect 32 items. Rachel's goal is to collect 24 items. If Rachel and Bryce each meet their goal, what fraction of Bryce's goal does Rachel collect?

Answers

I think the fraction would be 3/4.

Rachel collects 3/4 or 75% of Bryce's goal if they both meet their goals in the canned goods drive

The question involves determining what fraction of Bryce's goal Rachel collects if they both meet their personal goals for a canned goods drive. Bryce's goal is to collect 32 items, and Rachel's goal is to collect 24 items. To find the fraction of Bryce's goal that Rachel collects, you divide Rachel's goal by Bryce's goal.

Here's the calculation:

Rachel's collection / Bryce's collection = 24 / 32 = 3/4

This means that Rachel collects 3/4 or 75% of the number of items that Bryce collects

Suppose the Willard gold nugget was turned into 4 equal sized gold bricks. If one of the bricks was sold how many ounces of the Willard nugget would be left?

Answers

788/4= 197; 197 ounces for each golden brick. 

---- 197x4= 788 so if 197 oz was sold then 788-197= 591oz.

 > There would only be 591 oz left

The number of ounces left after one brick is sold is 591.

What is an expression?

An expression is a way of writing a statement with more than two variables or numbers with operations such as addition, subtraction, multiplication, and division.

Example: 2 + 3x + 4y = 7 is an expression.

We have,

Willard gold nuggets = 788 ounces

The number of equal-sized bricks = 4

Now,

The number of ounces in each of the 4 bricks.

= 788/4

= 197 ounces

Number of bricks sold = 1

The remaining ounces.

= 788 - 197

= 591 ounces

Thus,

The number of ounces left is 591.

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is 660 ten times as many as 600?

Answers

Im pretty sure (like 99.9999999% sure) that 660 is not 10 times as much as 600 because when you multiply 600 by 10 you don't get 660. You get 6000.
2b. 660 is not 10 times as much as 600 it's like 1.1 times as much

Zero point zero six divided by one hundred twenty two

Answers

0.000491803279

Hope i helped
The answer is :
0.004918032786885

Anna saves 5/8 of her money. What percent of her money does Anna save?

Answers

 the amnwer is 1.6. all you do is 8 dived by 5

Anna would have saved 62.5% of her money.

Need help with Solving for X

Answers

5+x+(-2)= - 8
or,5+x-2+8=0
or,x+11=0
or,x= -11

Maddie has 2 times as many stickers on her notebook as meg. together they have 15 stickers. how many stickers are on maddie's notebook?

Answers

Maddie has 10 stickers. 
Maddie had 10 stickers

PLEASE HELP I WILL GIVE 50 POINTS
Using the distributive property, an expression equivalent to 48 + 30 is
5(6 + 8).
(6)(8) + (3)(10).
(3)(16) + (6)(5).
6(8 + 5).

Answers

48+30 is 78, so we need to find the equation that is equal to that.
The first one is not enough, the second one is too much, and the third one is too much as well. The fourth on is the answer.

Answer:

Step-by-step explanation:

78

Eric conducted a survey of the cars in four parking lots and wrote the following observations: 15 of the 36 cars in lot 1 were blue 43 of the 92 cars in lot 2 were blue 12 of the 30 cars in lot 3 were blue 32 of the 52 cars in lot 4 were blue based on the survey, which parking lot had the greatest present age of blue cars

Answers

Lot One:
15 divided by 36 = 0.4166  convert to % by moving the decimal two places to the right.  round if needed. 
Lot One = 41.66 %

Lot Two:
43 divided by 92 = 0.4673
Lot One = 46.73 %

Lot Three:
12 divided by 30 = 0.4
Lot Three = 40%

Lot Four:
32 divided by 52 = 0.6153
Lot Four = 61.53 %

Lot Four had the greatest % of Blue cars.

The percentage of blue cars in the lot is the ratio of the number of blue cars to the total number of cars in each lot ; Hence, lot D has the greatest percentage of blue cars

Percentage of blue cars in each lot :

Number of Blue cars / total number of cars

Lot A :

% blue cars = 15 / 36 = 0.4167

Lot B :

% blue cars = 43 / 92 = 0.4673

Lot C :

% blue cars = 12 / 30 = 0.40

Lot D :

% blue cars = 32 / 52 = 0.615

Therefore, lot D has the greatest percentage of blue cars.

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how do you write S is the set of natural numbers that are less than 8 in roster form

Answers

In mathematics, the roster form is when we call a group of set members that is placed inside between brackets, and is separated by commas. So in this case, natural numbers which are less than 8 are 1 to 7, hence the roster form is:

{1, 2, 3, 4, 5, 6, 7}

how do you write the number 7.04 in expanded form?

Answers

7.04 = (7 x 1) + (0/10) + (4/100)
hmmmm..
its been a while since ive done this... lol
so if i remember correctly...
7.04...
oh boy... gimmie a min to look back at my math books....

how can you evaluate |-5|

Answers

The absolute value is 5

How do you convert 10/6 into a mixed number

Answers

Well, First you want to find out how many times six can go into ten. Since its only once, you immediately get the number 1 as your whole number. Now because you've taken six out of ten you're left with 4/6. The mixed number would be 1 and 4/6 or 1 and 2/3 if you're simplifying
Hi. To convert 10/6 into a decimal, you simply divide the bottom into the top. In this case, it would be 10 ÷ 6.

6 can go into 10 1 time and will have a remainder of 4. You bring the 4 up and place the 6 under it. This will give you the mixed number of 1 4/6 which can be reduced to 1 2/3

See the attached for a visual. Hope this helps. If you have further questions, please don't hesitate to ask.

Take care,
Diana

what is the area of the figure?

Answers

Notice that the triangle is a right isosceles triangle, because the given angle measures are 45° and 90°, so the third angle measure is 180°-90°-45°=45°.

The length of the hypotenuse is 24 ft. Let the side lengths of the 2 equal sides be a.


By the Pythagorean theorem we have:

[tex]a^2+a^2=24^2[/tex]

thus

[tex]2a^2=24^2[/tex]

divide both sides by 2, and take the square root:

[tex]a= \frac{24}{ \sqrt{2} } = \frac{24 \sqrt{2} }{2}=12 \sqrt{2} [/tex]


The area of the triangle is given by the formula:

(1/2)*side*side, so the area of the triangle is :


(1/2)*[tex]12 \sqrt{2}[/tex]*[tex]12 \sqrt{2}[/tex]=144 (square units)


Answer: 144 square units


Write the prime factorization of 216 in exponencial from.

Answers

the prime factorization is 2^3*3^3

math question down below

Answers

Hi Andres!

[tex] (5\frac{1}{4})/( -2\frac{1}{2}) =(20+1)/4/- (4+1)/2 = 21/4/-5/2 =-21/10 = -2.1[/tex]

The directions: Write an equation in point-slope form of the line that passes through the given point and has the given slope m. The problem: (2,1), m=2

Answers

point slope form y- y1 = m(x- x1) coordinates are (2,1) m=2

so the equation becomes y-1= 2(x-2)

500 - 137 = to what

Answers

if the question your asking is what is 500-137=? then the answer is 363

If u subtract 500 from 137 you get 363 


Remember to stay litty

Your heart beats 240 times in 4 minutes what is your heart rate in beats per second

Answers

240÷4=60
60÷60=1
answer: 1

Goldbach''s Conjecture is a famous conjecture that has never been proven true or false. The conjecture states that every even number. except 2, can be written as the sum of two prime numbers. For example, 16 can be written as 5 + 11.

Answers

has been proven TRUE.... hope it helps buddy have a great day hope you pass

Yes this is true.
Hope this Helped
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Eight members of the Math club equally shared three pizzas. Expressed as a fraction,whAt part of a pizza did each member receive ?

Answers

3/8 of a pizza.

If you divide each pizza into eight parts, each member would receive 1/8 of one pizza. Since there are three pizzas, each member would receive three 1/8 of a pizza, or 3/8.

You can prove this answer by multiplying 3/8 by 8, to get 24/8 simplified to 3.

A scooter travels 30 feee in 2 seconds.

What is the speed of the scooter in feet per second?

(If you get the question right you will be marked as brainliest.)

Answers

30 ft in 2 seconds = 30/2 = 15 ft per second

We have that for the Question "A scooter travels 30 ft in 2 seconds.  

What is the speed of the scooter in feet per second?

" it can be said that the speed of the scooter in feet per second is mathematically given as

V=15ft/s

From the question we are told

A scooter travels 30 ft in 2 seconds.  

What is the speed of the scooter in feet per second?

Generally the equation for the speed of the scooter in feet per second is mathematically given as

[tex]V=\frac{v}{s}\\\\Therefore\\\\V=\frac{v}{s}\\\\V=\frac{30}{2}\\\\[/tex]

V=15ft/s

Therefore

the speed of the scooter in feet per second is mathematically given as

V=15ft/s

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Solve for c.

a=11+4b−4c

A)c=a+b-11/-4
B)c=a+4b+11/-4
C)c=a-4b-11/-4
D)c=a-b+11/-4

Answers

a=11+4b-4c
a+4c=11+4b
4c=4b-a+11
c=(4b-a+11)/4
c=(a-4b-11)/-4
so the answer is 'C'

the answer is c

i hope it helped!

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