for the curve y = f(x) show that the gradient of the secant passing through the points ( x, f(x) and (x + h) is f(x +h) - f( x)/h

Which shows the first equation written in slope-intercept form? 1/2 (2y + 10) = 7x

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25

Pamela has a 30-year, 5.75% mortgage on her $250,000 home. she has been paying on it for 5 years, and has recently hit some financial trouble. if her lender agreed to lower the interest rate on her $231,905.47 balance to 5.5%, what will her new payment be for the remainder of the loan?