Write the equation that matches the model

Which of the following is true for the relation f(x)=2x^2+1

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

Fatima plans to spend at least $15 and at most $20 dollars on sketch pads and pencils. if she buys 2 sketchpads, how many pemcils can she buy while staying in her price range? fatima can buy between and pencils. ? (type whole numbers. use ascending? order.)