I have one more question I don't understand. It's a multiple choice question. I need to pick which of the following describes the steps involved in using the graph of y=3 cos x+3:
a. Stretch the graph vertically by a factor of 3 and shift it to the left 3 units.
b. Stretch the graph vertically by a factor of 3 and shift it down 3 units.
c. Stretch the graph vertically by a factor of 3 and shift it to the right 3 units.
d. Stretch the graph vertically by a factor of 3 and shift it up 3 units.
Compared to a y = cos x curve, the coefficient 3 in front of the cosine term stretches the curve vertically by a factor of three. That is in all foure of your multiple choices. Adding the number 3 to the "y" value should tell you what else happens to the function.