Answer:

Step-by-step explanation:
Based off of what we do know, if we can find length DB we can use the pythagorous theorem (I will be assigning the variable z)

First equation is for triangle ABD
Second is for BCD
And the last one is for ACD
Substitute
and 

As discovered before

Ray should buy the first one because it has the greater volume by 1,440 square inches.
Tank 1: 20x20x18=7,200
Tank 2: 40x12x12=5,760
7,200-5,760=1,440
Answer:
Yes
Step-by-step explanation:
Because it passes vertical line test.
Answer:
1/4 N + 15
the coefficient is "n" it is a letter variable associated with a term
Step-by-step explanation:
0<r<6
the least number of ride he can go on is 0 which is none and the most is 6 because 15/2.50=6