Grace's average in math for the first nine weeks was an 88. her second nine weeks average decreased 12.5%. what was her average for the second nine weeks?

To find the inverse of a number a, one can use the equation f(c) = a-1/c=0 where c is the inverse of a use the secant method of finding roots of equations to find the inverse of a = 2.5 ,er = 0.001%