Answer:
6
Step-by-step explanation:
8 - x + 4x = 26
8+3x=26
3x=26-8
3x=18
x=18/3
x=6
angle D is 90⁰
E is 66⁰
and F is 114⁰
k=29
C:-217
f(-2)=0.5*(-2)^2+9.5*(-2)-200
=2-19-200
=-217
