Can someone help me with numbers 9 ,10, 11 ,12 I am very confused, please? This is due at 9:00 pm!

Δabc is reflected across line l to form δ alblcl, and a¯¯¯al¯¯¯¯ intersects line l at point d. which equation is not necessarily true?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

If olu is twice as old as funmi if the sum of their ages is 60 how old is olu