91Ó°ÊÓ

Solve. What percent of 40 is \(9 ?\)

Solve using the multiplication principle. Don't forget to check! $$ \frac{2}{7}=\frac{x}{3} $$

Solve and check. Label any contradictions or identities. $$5(t+1)+8=3(t-2)+6$$

Solve using the multiplication principle. Graph and write both set-builder notation and interval notation for each answer. $$ 1.8 \geq-1.2 n $$

Solve using the multiplication principle. Don't forget to check! $$ -\frac{3}{5} r=-\frac{3}{5} $$

Justin rode his bicycle at a rate of \(15 \mathrm{mph}\) and then slowed to \(10 \mathrm{mph}\). He rode \(30 \mathrm{min}\) longer at \(15 \mathrm{mph}\) than he did at \(10 \mathrm{mph}\). If he traveled a total of \(25 \mathrm{mi}\), how long did he ride at the faster rate? [Hint: Convert minutes to hours or hours to minutes.

Review operations with real numbers. Simplify. $$ -2+(-5)-7 $$

Solve and check. Label any contradictions or identities. $$2(7-x)-20=7 x-3(2+3 x)$$

Courtney rode her scooter to the library at a rate of \(25 \mathrm{mph}\) and then continued to school at a rate of \(15 \mathrm{mph.}\) It took her 4 min longer to get to the library than it did for her to get to the school from the library. If she traveled a total of \(15 \mathrm{mi}\), how long did it take her to get to the library? [Hint: Convert minutes to hours or hours to minutes. \(]\)

Solve using the multiplication principle. Don't forget to check! $$ -\frac{2}{5} y=-\frac{4}{15} $$