How to find the exact value of a trigonometric function?

Perform the required operations on the following functions given: f(x)= 3-x; g(x)= -2x find g[f(x)]

Asquare is dilated by a scale factor of 1.25 to create a new square. how does the area of the new square compare with the area of the original square? a)the area of the new square is 1.25 times the area of the original square. b)the area of the new square is 2.50 times the area of the original square. c)the area of the new square is 1.252 times the area of the original square. d)the area of the new square is 1.253 times the area of the original square.

What are “like terms”? why can we only add like terms?