Help me solve this problem please

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

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) .

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?