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Minoxidil is a drug that has recently proven to be effective in treating male pattern baldness. Water must be added to \(20 \mathrm{mL}\) of a \(4 \%\) minoxidil solution to dilute it to a \(2 \%\) solution. How many milliliters of water should be used? (Hint: Water is \(0 \%\) minoxidil.)

In one day, a store sold \(\frac{8}{5}\) as many DVDs as CDs. The total number of DVDs and CDs sold that day was \(273 .\) How many DVDs were sold?

Find two consecutive odd integers such that when the lesser is added to twice the greater, the result is 24 more than the greater integer.

Under what conditions must the inequality symbol be reversed when solving an inequality?

Solve inequality. Write the solution set in interval notation, and graph it. \(3 x<18\)

Solve each equation, and check your solution. $$ x+21.5=-13.4 $$

A recipe for whole-grain bread calls for 1 oz of rye flour for every 4 oz of whole-wheat flour. How many ounces of each kind of flour should be used to make a loaf of bread weighing 32 oz?

Solve inequality. Write the solution set in interval notation, and graph it. \(6 m \geq-24\)

A formula is given along with the values of all but one of the variables. Find the value of the variable that is not given. Use 3.14 as an approximation for \(\pi\) (pi). $$ S=2 \pi r h ; \quad S=120 \pi, h=10 $$

Solve each equation, and check your solution. $$ 9 x+1=8 x+4 $$