In which quadrants are x and y either both negative
numbers or both positive numbers?

quadrants 1 and 3

Step-by-step explanation:

the quadrants start at the top right and go counterclockwise. above the x axis x is positive and to the right of the y axis y is positive. so x and y are both positive in the top right: quadrant 1. by the same logic, x and y are both negative in the bottom left: quandrant 3.

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify

the answer is (-8,-5)

step-by-step explanation:

the endpoint to midpoint is half the length. the length is (-2,-1) so when you are at the midpoint just add it to it to find your answer -6+(-2)= -8 and -4+(-1)=-5 so (-8,-5)