15. Sam wanted to know how much the price of milk had changed over the last few decades. He

found that the price of a gallon of milk was $0.80 in 1970 and in 1990 it was $1.20. What

was the average rate of change in a gallon of milk per year?

Do not enter $ in your answer. Make sure to include a negative sign if annlicable

1 mph

step-by-step explanation:

if the question is asking how much does she drive per mile then,

13 / 13 = 1 mph

isocolese triangle

we know that the line connect a and b is the hyptonuse

so first find the hypotonuse length using the distance formula, call the length c

since it is an isocolese triangle, the lengths of the legs are the same

using pythagorean theorem,

in this case, a=b since isocolese triangle so we get

or

we can find c so we can find the distances

we know that if we draw 2 circles, each has center at a and b, and find where they intersect, we can the 2 possible locations for c

if a has center at (xa,ya) and b has center at (xb,yb), then we can solve where

and

intersect to find where they intersect

i'm not going to put an example because i have to go to class. i hope this explanation is enough

the answer is  

c.

90.0π cm^2

hope you got it.