1. -28 = -3n + 5
what is n??
2.5−n3=−4

1.

n=11

2.

Step-by-step explanation:

Question 1:

The given equation is:

Subtract 5 from both sides:

Divide boy sides by:

-3

Question 2:

The given expresion is :

Subtract 5 from both sides

This implies that;

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.