A decade ago, the average class size at Yardley Middle School was 20 students. Now it is 25% smaller. What is the average class size currently?

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.

could u provide us some answer choices or hmm idk maybe a table for us to anser with ? ?

mr. india

a long term investor

step-by-step explanation:

because he is a long term investor