If a=-3, then - (a4) =
A -12
B 81
C-81
D 12

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

Find the magnitude, correct to two decimal places, made by each of the following with positive direction of the x axis a) y= x the answer is 45° but i don’t know how

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction