It costs $3.45 to buy 2 lbs of chopped walnuts. How much would it cost to purchase 7 lbs of walnuts? Explain and show your reasoning its ratios an rates

Darcy deposited $390 into a savings account. as long as the account balance remains at or above $150, she does not have to pay a service fee for the account. for how many months can she withdraw $40 a month without having to pay service fees? a) 3 b) 5 c) 6 d) 9