What is the product of the square root of 30 time the square root of 10

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

Mary beth used the mapping rule to find the coordinates of a point that had been rotated 90° counterclockwise around the origin. examine the steps to determine whether she made an error. m (3, –6) is rotated 90° counterclockwise. (x, y) → (–y, x) 1. switch the x- and y-coordinates: (6, –3) 2. multiply the new x-coordinate by –1: (6(–1), –3) 3. simplify: (–6, –3) .

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps