Which of the following represents the equation of a line with a slope of 2 and a y-intercept of (0, 4)?

y=2x+4

Hope this helps :)                                                                                                                                                            

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

: )