How much is a $56 video game with a 30% discount?

For what values of b will f(x)= logbx be a decreasing function? (16 )

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2