NerdyKid

Because it is proportional to the respected numbers square. 4^2=16 and because it is proportional 80/16=5. We have to square 8 to get 64 and then multiply that value by 5 to get 320. 

Adding 1/6 to both sides we get 2/3a=1/2. Multiply both sides by 3/2 to get a by itself on one side. By doing this we get a=3/4

We have to get a common denominator in both equations. Let's try to make it positive and the smallest, so it would be 12. Multiplying the left side by 4 would get us (20-4c)/12 and multiplying by -3 on the right side would get us (-6c-6)/12. We can cancel out the denominators by multiply both sides by 1/12 to get 20-4c=-6c-6. Adding 6 to both sides gets us -4c+26=-6c and adding 4c to both sides gets us 26=-2c. Divide by -2 on both sides to get c = -13. Hope this helps!

We can find the unit rate by dividing gallons by price. 70/21 is 3 1/3 and 50/15 is 3 1/3. Both are the same prices so it depends on your personal choice. I would choose the gas that is better for the environment.

Let's start by finding a unit rate. Dividing the price by pounds will give you the price for one pound. If we do 29.85/1.5 we get 19.9 and if we do 20.28/1.2 we get 16.9. 19.9 > 16.9. We always want the better deal, so I would choose the granny apples.

I answerd that, but why doesn't it count as me. I just registered

Let's start by making a proportion 120/800=x/100, we can simplify 120/800 into 15/100. By doing this 15/100 = x/100. This makes it really easy for us, so there are 15 people running for the cause out of 100.

At least you learnt it now, but good explanation still

There are 9 pizzas so assuming that they are the same price. The equation would be x=85.50/9, when you divide for it you get x as 9.50

1. For a triangle XYZ, we use [XYZ] to denote its area.

Let ABCD be a square with side length 1. Points E and F lie on line BC and line CD, respectively, in such a way that angle EAF=45 degrees If [CEF]=1/9, what is the value of [AEF]?

2. A triangle T is separated into two congruent triangles by a straight cut. Which of the following statements are true?

A) T must have two sides with equal length.
B) The cut must be perpendicular to one side of T.
C)  T must have two interior angles with the same measure.
D) The cut must go through the midpoint of one side of T.

Type your answer as a list of letters separated by commas. For instance, if you believe that conditions A, B, and C are enough, then type "A,B,C" into the answer box. If you believe none of the options are correct, enter "none."

3.   Line PS bisects angle QPR . We can ensure that triangle PQS is congruent to triangle PRS by adding just one more condition. Which of the following statements could be that condition?

A) PQ=PR
B) SQ=SR
C) Angle PQS=Angle PRS
D) Angle PSQ=Angle PSR

Hint: The figure is a kite bisected into two parts from P to S
Type your answer as a list of letters separated by commas. For instance, if you believe that any of the conditions A, B, or C would be enough, then type "A,B,C" into the answer box. If you believe none of the options are correct, enter "none."