Can someone explain how to factor 8x + 20?

Which of these triangle pairs can be mapped to each other using two reflections?

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

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.