You know that 3+3+3+3=4*3=12.this shows that 4 groups of 3 equal 12. the expression x +x+x+x+=4x means x is used as an addend 4 times. write an equivalent expression for m+m+m.

4m

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.

answer: your correct answer is b. d.

step-by-step explanation: