Simplify 8 to the -5th power over 8 to the -3rd power

the first one

Step-by-step explanation:

i had that question

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.

pooopoopopoopop

step-by-step explanati∵∵∴∴on: