Una has a collection of 28 insects. 1/4 are butterflies, 2/7 are moths, and the rest are beetles.

how many insects are beetles?

Determine the quotient and remainder when (6a3)+11a2-4a-9) is divided by (3a-2) express your answer in the form q(a) + r(a)/d(a)

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?

Calculate the annual effective interest rate of a 12 % nominal annual interest rate compound monthly