Translate into an equation the sum of two times a number and 5 is 11

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

Plzz ! if you were constructing a triangular frame, and you had wood in the length of 4 inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no? = explain your mathematical thinking/show your work:

How much would it be worth in 5, 10, 20 years