Help all mathematicians!

Choice D

Maximums = (0,1) and (2pi, 1)

minimum = (pi, -3)

Explanation:

Cosine is a periodic function that bounces up and down forever. The highest y = cos(x) gets is y = 1 and that happens when x = 0, 2pi, etc. Basically anything in the form x = 2pi*n for any integer n will have y = cos(x) maxed out. Consequently, this means y = 2cos(x)-1 maxes out at the same mentioned x values.

Plug in those x values to find that y = 1 is the max y value for y = 2cos(x)-1

A similar situation happens for the mins as well. We have y = cos(x) be the smallest when x = pi+2pi*n for any integer n.

d (5 x (-20)) * (100 x (0.7))

step-by-step explanation:

5÷1/100 * -.7 *-20

copy dot flip

5*100 * -.7 *-20

rearrange

5*-20   * 100 *-.7

-100   *-70

7000

the y will be in still but your answer will be y x 3

step-by-step explanation:

jk: )