Answer:
44m
Step-by-step explanation:
area of a trapezoid = (a+b)* h/2
since the distance between two parallel sides is 15, that would be your height
plug everything in and you get:
480 = (20 + b) *15/2
b = 44
I believe that the answer is C
Answer:

Solving Steps
Use the quadratic formula

Multiply / Remove the parentheses / Evaluate

Calculate

Separate the solutions

Simplify

You use the area for volume length times width times high
8x4313x2628
Answer:
10,454,400 sec
Step-by-step explanation:
1Day=24hr
1hr=60min
1min=60sec
121 days=121*24*60*60=10,454,400sec