What are strategies we can use to calculate fractional percentages (including sales tax)?

The tangent of an angle is not which of the following? a) ratiob) proportionc) fractiond) opposite over adjacent

Zoey made 5 1/2 cups of trail mix for a camping trip. she wants to divide the trail mix into 3/4 cup servings. a. ten people are going on the trip. can zoey make enough 3/4 cup servings so that each person gets one serving? b. what size would the servings need to be for everyone to have a serving?

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x