Students were asked to write 6x + Xx - 3x +
in standard form. Shown below are four student
responses. Which student 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