math
posted by alisha .
What would be the monthly payment on a $90,000 mortgage at a rate of 7.5% interest for
30 years?

Try this online calculator
http://www.mortgagecalculator.org/
set the tax rate to zero.
or
i = .075/12= .00625
solve for x
90000 = x[1  1.00625^360]/.00625
I got 629.29
(the online calculator got the same thing) 
thank you so much for that online calculator. it is very helpful