A group of five students was asked how many sit-ups they could do in a minute. The mean of the group was 58 sit-up s. One student did 43, one did 57, one did 63, and one did 52. How many did the 5th student do?

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.

1 3 5

step-by-step explanation:

i took the test: )

step-by-step explanation:

de-gf

hj=3x+20

ji=15x-64