Very confused, would like the answers and an explanation

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

Hurry and answer this! circle x with a radius of 6 units and circle y with a radius of 2 units are shown which steps would prove the circles similar? translate the circles so they share a common center point, and dilate circle y by a scale factor of 4. translate the circles so the center of one circle rests on the edge of the other circle, and dilate circle y by a scale factor of 4. translate the circles so they share a common center point, and dilate circle y by a scale factor of 3. translate the circles so the center of one circle rests on the edge of the other circle, and dilate circle y by a scale factor of 3