a students cost for last semester at her community college was 2000. she spent 300 of that on books. what percent of lasts semesters college costs was spent on books

(reasons why im not going to collage)

Step-by-step explanation:

300/2000=.15

she spent 15 % on books

step-by-step explanation:

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.