91Ó°ÊÓ

Simplify. $$ \frac{15 \cdot 4 x y \cdot 9}{6 \cdot 25 x \cdot 15 y} $$

Solve. Consider only integer replacements. $$2<|x|<5$$

Perform the indicated operation and, if possible, simplify. If a quotient is undefined, state this. $$ \frac{3}{4} \div\left(-\frac{2}{3}\right) $$

Simplify. $$ 25-(-12)-7-(-2)+9 $$

After five rounds of golf, a golf pro was 3 under par twice, 2 over par once, 2 under par once, and 1 over par once. On average, how far above or below par was the golfer?

Simplify. $$ -31+(-28)-(-14)-17 $$

Translate to an inequality. The distance from \(t\) to 0 is at least \(20 .\)

Perform the indicated operation and, if possible, simplify. If a quotient is undefined, state this. $$ \frac{5}{9}-\frac{7}{9} $$

Simplify. $$ -7 t^{3}-t^{2}-3\left(5 t^{3}-3 t\right) $$

Combine like terms. $$ 4 x-7 x $$