PLEASE ANSWER IT I NEED HELP NOW THANK YOU SO SO MUCH.

Step-by-step explanation:

a  is just the peak value which looks like  a = 2.5

this cos wave function has a phase shift of 60°    A normal cos function with no phase shift has a b of zero

so to make this cos function to have NO phase shift we would substract 60° then cos 0 would be 1×a  so b = -60°

y = 2.5cos(x-60)     when x =60    cos(60-60) = 1     y = 2.5×1

The second question is odd but i'll try

   y = f(2x)      (4, 10)       the origianl f(x) was (4, 5)

   y = f(x) - 7    (4, -2)

step-by-step explanation:

there is a formula i can give you:

it is r^2*n*sin(360/n) divided by 2 where r represents the "radius" and n is the number of sides.

plug them in:

(10sqrt(3))^2*6*sin(360/6) divided by 2

100*3*6*sin(60) divided by 2

900*sin(60)

900*sqrt(3)/2

450*sqrt(3)

approx is 779.4 cm^2