91Ó°ÊÓ

Evaluate each of the given expressions by performing the indicated operations. $$\frac{|-2|}{-2}-(-2)(-5)$$

Simplify the given expressions. In each of \(5-9\) and \(12-21,\) the result is an integer. $$\sqrt{81 \times 10^{2}}$$

Perform the indicated multiplications. $$(5 p-2 q)(p+8 q)$$

Round off the given approximate numbers \((a)\) to three significant digits and (b) to two significant digits. $$30.96$$

Set up an appropriate equation and solve. Data are accurate to two sig. digits unless greater accuracy is given. Two gasoline distributors, A and B, are 228 mi apart on Interstate \(80 .\) A charges \(\$ 3.40 /\) gal and \(\mathrm{B}\) charges \(\$ 3.20 /\) gal. Each charges \(0.2 \mathrm{g} / \mathrm{gal}\) per mile for delivery. Where on Interstate 80 is the cost to the customer the same?

Perform the indicated divisions. Express the answer as shown in Example 5 when applicable. $$\left(x-14 x^{2}+8 x^{3}\right) \div(2 x-3)$$

Evaluate each of the given expressions by performing the indicated operations. $$30(-6)(-2) \div(0-40)$$

Simplify the given algebraic expressions. $$2\left[4-\left(t^{2}-5\right)\right]$$

Each of the given formulas arises in the technical or scientific area of study shown. Solve for the indicated letter. \(Q_{1}=P\left(Q_{2}-Q_{1}\right),\) for \(Q_{2} \quad\) (refrigeration)

Perform the indicated multiplications. $$\left(x^{2}-1\right)(2 x+5)$$