10. Find the slope between the points (3,0) and (2, 4).

slope = -4

Step-by-step explanation:

slope formula is

slope = y2-y1/x2-x1

as we know that from the question x1 = 3 , y1 = 0

and x2 = 2 , y2 = 4

then put these equation in the slope formula and we get slope which is equal to (-4)

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.