X 5.3.5
Substitute the given values into the formula, and solve for the unknown variable
A= zh(B+b); A = 12, B = 2, b = 1

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

idk the answer but just put a

step-by-step explanation:

.mp4 files, because, video

-2

7 - 9 = -2

reversed:

-2 + 9 = 7