Posted by David on .
If the area in square units of the region under the curve of the function f(x)=5, on the interval from x=a to x=8 is 20 square units what is the value of a?
4
5
6
7
8

Urgent help calculus 
Steve,
you have a rectangle with height 5 and width 8x.
So, 5(8a) = 20
8a = 4
a = 4
No need for calculus here!