Which of the following expressions represents the statement below?
five times a number plus 9

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.

using pemdas, (order of operations) you'll see the answer is 24.

answer: a.12cm

step-by-step explanation: