Answer:
C. -3x + 15 = 18
Step-by-step explanation:
substitute x with -1
-3(-1) + 15 = 18
a negative times a negative equals a positive
3 + 15 = 18
x = 0.2
2x^2+x=-1
4x + x = -1
5x = -1
divide by 5
5x/5 = -1/5
Since C is 61 degrees, A is 90 degrees because of the right angle, and B would be 29 degrees because you add 61 and 90 together and subtract that amount from 180.
Wait I'm sorry if this is what you aren't looking for-
30
9 + 13 = 22
22 + 43 = 65
65 + 55 = 120
120 ÷ 4 = 30
hope this helps
