Rafael's salary last year was $49,500 and he took home $38,610. What was his federal income tax withholding
rate?

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

If $740 is invested at an interest rate of 11% per year and is compounded continuously, how much will the investment be worth in 7 years? use the continuous compound interest formula a = pert.

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?