E-1/2f when e=15 and f=2

What signals you that factoring by grouping is the best method to use when factoring a problem?

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?