Write the series using summation notation.
4 + 8 + 12 + 16 + 20+ . . . + 80

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?

Divide. –4.2 ÷ 6 = a –0.7 b 0.7 c –7 d 7 me

What are two numbers that add up to -9 and multiply to -10 best answer gets branliest and 100 extra points