Answer:
A=2
B=8
C=-38
X=2.8/X=-6.8
Step-by-step explanation:
8.5
Do you mean "(a+5)2/3
(a + 5) 2/3 = 9
a + 5 = 13.5
a=8.5
0.0009
9*10⁻⁴ = 0.0009