How do you write 3x-7 in words or math

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

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

Nine more than four times a number is the same as one less than twice the number. find the number?