The morning temperature is -15° by the afternoon the temperature rises by 20° right in addition expression for the afternoon temperature and then to show this and find the temperature in the afternoon

The afternoon temperature is

5°

Step-by-step explanation:

Step one:

given data

the morning temperature=  -15°

the afternoon temperature rose by  20°

Required

The afternoon temperature

Step two:

Hence the afternoon temperature is given as

=-15°+20°

= 5°

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.