To build your vocabulary skills, answer the following question. Mark your answer on a separate sheet of paper. The caravan of traders experienced many difficulties while crossing a depression. In which sentence does depression have the same meaning as it does in the sentence above? a. A tropical depression is beginning to form in the gulf. b. A salt marsh is located at the southern edge of the depression. c. The depression in the cotton market took the merchants by surprise. d. By the third day of the sandstorm, a slight depression had set in among the tourists.

In the standard $(x,y)$ coordinate plane, what is the slope of the line given by the equation $5x = 9y + 18$?

F. $-\frac{5}{9}$

G. $\frac{5}{9}$

H. $\frac{9}{5}$

J. $5$

K. $9$

The Curiosity rover sent to explore the surface of Mars has an electric generator powered by heat from the radioactive decay of $^{238} \mathrm { Pu }$, a plutonium isotope that decays by alpha emission with a half-life of 88 years. At the start of the mission, the generator contained $9.6 \times 10 ^ { 24 }$ nuclei of $^{238} \mathrm { Pu }$. What was the approximate activity of the plutonium source at the start of the emission? A. $2 \times 10 ^ { 21 } \mathrm { Bq }$ B. $2 \times 10 ^ { 19 } \mathrm { Bq }$ C. $2 \times 10 ^ { 17 } \mathrm { Bq }$ D. $2 \times 10 ^ { 15 } \mathrm { Bq }$ E. $2 \times 10 ^ { 13 } \mathrm { Bq }$

Use each element in the table at least once to create sentences using the necessary form of jugar. 1. 2. 3.

Solve each system by the substitution method. Be sure to check all proposed solutions.

$$\left\{\begin{array}{l}{x+3 y=8} \\ {y=2 x-9}\end{array}\right.$$

(a) The equation $A x+B y=0$ represents a line through the origin in $R^{2}$ if A and B are not both zero. What does this equation represent in $R^{3}$ if you think of it as $A x+B y+0 z=0$? Explain. (b) Do you think that the equation $A x_{1}+B x_{2}+C x_{3}=0$ represents a plane in $R^{4}$ if A, B, and Care not all zero? Explain.

Predict the effect of the loss of forests on cellular respiration in other organisms.

Write True if the statement is true. If the statement is false, change the underlined word or words to make the statement true. In amoebas, indigestible materials remain inside contractile vacuoles.

Use the following recent annual salaries (in millions of dollars) for players on the N. Y. Knicks professional basketball team.

$$\begin{array} { c c c c c c c c c c c c } { 23.4 } & { 22.5 } & { 11.5 } & { 7.1 } & { 6.0 } & { 4.1 } & { 3.3 } & { 2.8 } & { 2.6 } & { 1.7 } & { 1.6 } & { 1.3 } & { 0.9 } & { 0.9 } & { 0.6 } \end{array}$$

Find the standard deviation s.

The intensity of illumination I from a light varies inversely as the square of the distance d from the light. (a) Write this statement as an equation. (b) Determine the constant of proportionality if it is known that a lamp has an intensity of 1000 candles at a distance of 8 m. (c) What is the intensity of this lamp at a distance of 20 m?

Simplify each expression. $-4^{2}$

Show that

$$\int_{a}^{b} \frac{d t}{t}=\int_{1 / b}^{1 / a} \frac{d t}{t} \text { when } 0<a \leq b$$

Identify the major body of water nearest Osaka.

An electron starts from rest in a vacuum, in a region of strong electric field. The electron moves through a potential difference of 35 V. What is the kinetic energy of the electron in electron volts (eV)?