I need help. Please help with this

Combine like terms - in this case, that would be the real and imaginary parts:

(8 - 2i) + (5 + 9i) = (8 + 5) + (-2i + 9i)

… = 13 + 7i

Then a = 13 and b = 7.

answer: the answer is (b) amie should have multiplied

step-by-step explanation: given a sphere and a cylinder with same radius and height.

let, 'r' be the radius of the cylinder and sphere and 'h' be the height of the cylinder. according to the question,

r = h.

now, the volume of the sphere will be

and the volume of the cylinder will be

therefore, we have

thus, ammie should have multiplied the volume of the sphere