91Ó°ÊÓ

For Problems 41-52, use exponents to express each algebraic expression in a more compact form. For example, \(3 \cdot 5 \cdot x \cdot x \cdot y=15 x^{2} y\) and \((3 x)\left(2 x^{2}\right)=6 x^{3}\). $$ 3 \cdot 4 \cdot x \cdot y \cdot y $$

Jack is \(x\) years old, and Dudley is 1 year more than three times as old as Jack. How old is Dudley?

Simplify each of the numerical expressions. $$-5.2+6.8-4.7-3.9+1.3$$

Add or subtract as indicated, and express your answers in lowest terms. (Objective 1) $$\frac{13}{4 x}-\frac{3}{x}$$

For Problems 41-52, use exponents to express each algebraic expression in a more compact form. For example, \(3 \cdot 5 \cdot x \cdot x \cdot y=15 x^{2} y\) and \((3 x)\left(2 x^{2}\right)=6 x^{3}\). $$ 7 \cdot 2 \cdot a \cdot a \cdot b \cdot b \cdot b $$

Multiply or divide as indicated, and express answers in reduced form. $$\frac{5 y}{8 x} \cdot \frac{14 z}{15 y}$$

Multiply or divide as indicated, and express answers in reduced form. $$\frac{10 x}{-9 y} \cdot \frac{15}{20 x}$$

For Problems 41-52, use exponents to express each algebraic expression in a more compact form. For example, \(3 \cdot 5 \cdot x \cdot x \cdot y=15 x^{2} y\) and \((3 x)\left(2 x^{2}\right)=6 x^{3}\). $$ -2 \cdot 9 \cdot x \cdot x \cdot x \cdot x \cdot y $$

Simplify each of the numerical expressions. $$0.76(0.2+0.8)$$

Add or subtract as indicated, and express your answers in lowest terms. (Objective 1) $$\frac{1}{x}-\frac{7}{5 x}$$