Aaron borrows $150 from his friend austin. he has to pay the money back in 4 monthly installments. each month he wants to pay half the amount he paid the previous month. how much should austin pay the first month to repay the money as sched?

$80

$80+$40+20+$10=$150

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.

10

step-by-step explanation: