Anyone?? please? there's only 5 and i gotta get theses done asap

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?

Reinel saves 30% of every pay check. his paycheck last week was 560$. how much did reniel save last week?