C. When a rational and an irrational number are added, is the sum rational or irrational?

irrational

Step-by-step explanation:

example: rational=½=0.5

irrational=3.1428571…

0.5+3.1428571

3.6428571

It is irrational because it cannot be changed into fraction form

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

  the correct choice is marked

step-by-step explanation:

the first two graphs show multiple turning points. the last graphs matches the description in every detail.