Answer:
LMF.AO Try D it's the most compatible number set
That is way too much questions for one sitting. If you really struggle that much, download this app called photomath. You take a picture of one of the questions and then it instantly solves it and shows the work so you know how to do it.
For 16-25 however, you would need to rewrite your questions on a blank piece of paper with the variables substituted in. So let's say:
a + b² - (c-2).
You would need to rewrite it as the following in order for the app to solve it.
12 + 9² - (4 -2)
For f composite g, plug g into f
f(g)=6x^2+3
-3. -3
-3=6x^2
—. ——
6. 6
-3/6=x^2
square root of -3/6=x
then plug that number into
g composite f
f(f)=6(square root of /3/6)