The average change per hour is B 40.7
Circumference = (π) x (diameter)
Circumference = 8π
(π) x (diameter) = 8π
Diameter = 8
Radius = 4
Area = π x (Radius)²
Area = π x (4)²
Area = π x (16) = <u>50.27 units²</u> (rounded)
Is this what your asking: (x+3)(x^4 - x^2 + 5)
If you are then:
(x+3)(x^4 - x^2 + 5)
= (x+3)(x^2 + 5)
= x^3 + 3x^2 - 5x - 15
Looks kinda confusing but yh... Anyway, hope it helped :)