Answer:
a)
Step-by-step explanation:
Answer:
3
Step-by-step explanation:
maybe??? or 12 ........
Answer:
c or the 3d one
Step-by-step explanation:
I suppose you mean

Substitute y = √(9 + x). Solving for x gives x = y² - 9, so that 9 - x = 18 - y², and we have differential dx = 2y dy. Replacing everything in the integral gives

Simplify the integrand by dividing:


For the first term of this new integral, we have the partial fraction expansion


The rest is trivial:




To find the area of a trapezoid you do