Question

Which of the following describes the translation of the graph y = 3 cos x + 2 with respect to y = cos x?

Answer 1

In our case the parent function is y=cos x. If we stretch the amplitud by 3 units, we get

$y=3\text{cosx}$

and finally, if we translate this function 2 units up, we have

$y=3\text{cosx}+2$

which correspond to the second option from top to bottom.