In 28% of a sum is $100.80, what is the sum?

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

Determine the fraction of total interest owed. after the fourth month of a 12-month loan: the numerator is: {(n + ) + (n + ) + (n + ) + (n + )} = , and the denominator is: {(n) + (n + 1) + + (n + )} = . therefore, the fraction is numerator/denominator (to the nearest tenth) =

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?