Enter the value of x that make the parallelogram a rhombus

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

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?

Suppose that 15 inches of wire cost 60 cents. at the same rate, how much (in cents) will 12 inches of wire cost