Look at picture please !! I really need help thank you !

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

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11

Find the domain and range of the following function f(x) = 51x - 21+ 4