5- -5+ -9 × -12= ? plz me i don't know to do integers

In what form is the following linear equation written y=9x+2

If $740 is invested at an interest rate of 11% per year and is compounded continuously, how much will the investment be worth in 7 years? use the continuous compound interest formula a = pert.

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way