_____ is an “artificial ear” used to improve hearing.

Use the limit comparison test to determine whether the series converges or diverges. $\sum_{n=1}^{\infty}\left(1-\cos \frac{1}{n}\right),$ by comparing to $\sum_{n=1}^{\infty} \frac{1}{n^{2}}$

Graph each set of numbers on a number line. {all real numbers less than -1}

Find a substitution $x = Qy$ (where Q is orthogonal) that eliminates the cross-product term in the given equation. Sketch a graph of the transformed equation, where $3 x^{2}-2 x y+3 y^{2}=16$

Use the graph to answer the questions. Write the ordered pair that corresponds to point

$$Q$$

Solve the inequality and graph the solution on the real number line.

$$\frac{3(u-3)}{u+1}<0$$

Write the phrase as an algebraic expression. Use the variable $x$ to represent the unknown number.

The quotient of a number and thirteen.

Complete each of the following sentences with an adjective clause. Then, circle each relative pronoun.

I envied the ticket holders $\underline{\hspace{4cm}}$.

Solve each inequality. Graph the solution on a number line.

$\frac{1}{2}|2 x+1| \geq 2$

Write each number as the product of a real number and $i$. See the example in this section.

$$-\sqrt{-80}$$

To see how many vocabulary words you already know, match each boldfaced vocabulary word in the first column with a word that has a similar meaning in the second column.

4. intemperate d. praise

Simplify. If possible, use a second method or evaluation as a check.

$$\dfrac{\dfrac{1}{x-2}+\dfrac{3}{x-1}}{\dfrac{2}{x-1}+\dfrac{5}{x-2}}$$

Solve each inequality and graph the solution set on a number line. $2 x-5<3$

Where on this cross section would groundwater most likely flow out to the surface?

A. 1,2 , and 3

B. 1 and 3

C. 2 and 4

D. 2 only

E. 4 only