Does anyone know how to solve this

first and third quadrants

the answer B

Step-by-step explanation:

on the first quadrant x and y are both positive

in the second one x is negative and y positive so -x/y=-1

on the third quadrant x and y are both negative

so -x/-y=1

on the fourth quadrant x is positive and y negative so

x/-y=-1

here, in all cases x and y are taken the same length that's why we take always 1 or -1

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

: )