Your images are hard to read. You might want to try to find another method to present your work. This is what I think you have. Please confirm and others will be glad to assist.
your pics are kinda blurry, so make sure i got the problem right.
Get like denominators on both the top and bottom of the big fraction.
Multiply by the reciprocal:
C is very similar.
On A, do what's in parenthesis first, get a like denominator and simplify.
For: , get improper fractions, then a like denominator and finally simplify.
Multiply straight across; numerator by numerator; denominator by denominator.
You can think of it as:
Look for cross canceling. The 15 is an obvious one.
Then simplify as much as possible.