Twice the sum of six "x" and seventy eight.

Brady has a 20 year fixed rate mortgage for $215,500 with monthly payments of 1,305.89.the annual interest rate is 4%. what is the total cost of the principal and interest for this loan rounded to the nearest dollar

Find the multiplicative inverse of 8-12i

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!