Use a table of numerical values of f(x; y) for (x; y) near the origin to make a conjecture about
the value of f(x; y) the limit of as (x; y) => (0; 0). Then explain why your guess is correct.

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