**Answer:**

an integer is a rational number sometimes(eg.17=17/1) but not always.

a rational number can be written in the form p/q where p and q are integers.

**Step-by-step explanation:**

**Answer:**

A. 180°

**Step-by-step explanation:**

This is a simple subtraction problem.

212° - 32° = 180°

**Answer:**

C) x²-2x-15=0

**Step-by-step explanation:**

You could put both -3 and 5 in the equations to guess and check, but the better way is to use them to create the factors. If -3 is a root, one of the factors must be (x+3). If 5 is a root, the other factor must be (x-5).

(x+3)(x-5)

x²-5x+3x-15=0

x²-2x-15=0

The volume of the cylinder will be 900π cube cm.

**Step-by-step explanation:**

**Given**,

The volume of the cylinder 225π cube cm

Let the radius be r and the height be h.

**To find **the volume when the radius is doubled.

**Formula**

The volume of cylinder = π

According to the problem,

π = 225

When the radius is 2r the volume will be = π

=4π

=4×225π cube cm

= 900π cube cm