Answer:
Step-by-step explanation:
4. 10x + 30 = 90
10x = 60
x = 6
complementary
5. 4x + 40 + 3x = 180
7x + 40 = 180
7x = 140
x = 20
supplementary
Dont u think their should be more points for 4 hard questions
I'm not sure what you're asking but if you're looking for simplification, here it is. -7x² + 2x - 12