Any thing done
before the "main function" changes x (and so affects the graph horizontally), anything done
after the "main function" changes y (and so affects the graph vertically).
Here your "main function" is given as
.
multiplies by 5
after doing
and so affects the graph vertically.
The x-intercepts are where the graph "intercepts" the x-axis and so y= 0.
is the same as
or
. The x-intercepts are at x=
and
. Some people refer to the "x-intercepts" as just the x value (
and
) and some as the
points (
and
. Check with your teacher or textbook to see which convention is used in your class.
The y-intercepts are where the graph "intercepts" the y-axis and so x= 0. Just put x= 0 into
to get y= -1. Again, the y-intercept is either the value y= -1 or the point (0, -1) depending on the convention used.
I have no idea what "math pure 30" is but (liberal arts) colleges want you to be educated in a broad range of subjects. You will very likely be required to take at least one mathematics course in college.