Answer:
18
Step-by-step explanation:
48-12 = 36
36/2
18
18 divided by 30 is 0.6. So I would say that B, or 0.6, is the correct answer.
Answer
b. 32 sq. unit
Step-by-step Explanation
The area of the trapezoid is given by

We substitute the given values into the formula to obtain;

Simplify


Hence the area is
We can start by figuring out the axis of symmetry.
y = x² + 12x = x (x + 12)
So roots are x = -12 or 0
Therefore axis of symmetry is x = (-12 + 0) / 2 = -6
We got x-coordinate of vertex. Now plug in x=-6 to solve for y.
y = (-6)² + 12(-6) = 36 - 72 = -36
Therefore vertex is (-6, -36).