Answer: 
Step-by-step explanation:
By the geometric mean theorem,

So, by the Pythagorean theorem,

54 - 4a^2 + 3b^3 when a = -2 and b = 4 is
54 - 4(-2)^2 + 3(4)^3 = 54 - 4(4) + 3(64) = 54 - 16 + 192 = 230
Answer:
B
Step-by-step explanation:
so 8(2)=16=5x-4
5x=20
x=4
so B