Please help please no links please please anything helps

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

Okay so i didn't get this problem petro bought 8 tickets to a basketball game he paid a total of $200 write an equation to determine whether each ticket cost $26 or $28 so i didn't get this question so yeahyou have a good day.