A recursive formula is f (x) = f (x - 1) + 3x+1, where F(2)=9. What is F(1)?

If i have 20$ and i gave 5$ away how much i got

I’m stuck on this equation, anyone got the answer?

Problem situation: caren is making rice and beans. she can spend no more than $10 on ingredients. she buys one bag of rice for $4.99. beans cost $0.74 per pound. how many pounds of beans, x, can she buy? inequality that represents this situation: 10≥4.99+0.74x drag each number to show if it is a solution to both the inequality and the problem situation, to the inequality only, or if it is not a solution.