Answer:

Step-by-step explanation:
The area of a trapezoid is calculated using the formula:

We substitute the values into the formula to obtain:

We simplify the parenthesis to get:

We simplify further to obtain;

Answer:
15
Step-by-step explanation:
There is 15. 5x3=15, and no others factors would work!
Answer:
y=18 when x=15
Step-by-step explanation:
Please use * to denote mult. here, not "x." "x" is your variable and cannnot also be a symbol for mult.
f(x)g(x) = 3x^3 - 5x^2.
Now let x = 3:
(f*g)(3) = 3(3)^3 - 5(3)^2 = 81-45 = 36 (answer)