Please help Which expression is equivalent to 8a + 20?

4(2a + 20)

4(2a + 5)

4(4a + 16)

4(4a + 5)

The function f(x) = 14,600(1.1)* represents the population of a town x years after it was established. what was the original population of the town?

Factor the polynomial. b^2 + 4b + 4

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?