When Emmett began his science experiment, he had 20 milliliters of an unknown solution. During the experiment, the change in the volume of the solution was – 9 milliliters. What was the final volume of the solution?

Franco wants to double the volume of the cone. what should he do?

Kapil needed to buy a long wooden beam. he went to two sawmills that each charge an initial fee plus an additional fee for each meter of wood. the following equation gives the price (in dollars) of a wooden beam from the first sawmill as a function of its length (in meters). p = 5+20xp=5+20x

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items