Research the two civilizations that you did not describe in this week's Discussion Board. First, discuss why you think the two civilizations developed where they did. o For example, why would civilization develop in the northeast corner of Africa but not farther west? o What role did rivers play in the development of civilization? o Was climate a factor in early civilizations? Compare and contrast the two civilizations you have chosen in these three areas: political structures, writing, and the organization of their society.

The temperature in a town drops 4 degrees per hour for 2 consecutive hours. Use an integer to describe the overall change in temperature for the town. The temperature will change a total of \( \square \) degrees. (Simplify your answer.)

A collar of Styrofoam is made to insulate a pipe. Find its volume. The large radius \( R \) is to the outer rim. The small radius \( r \) is to the edge of the insulation. Use \( \pi \approx 3.14 \). \( \begin{array}{l} r=2 \mathrm{in} \text {. } \\ R=5 \mathrm{in} \text {. } \\ h=23 \mathrm{in} \text {. }\end{array} \)

\( \operatorname { fa } ( x ) = \ln ( x ( x ) \)

a. Velocidad de la luz \( =3 \times 10^{8} \mathrm{~m} / \mathrm{seg}= \) b. Velocidad del sonido \( =3.313 \times 10^{2} \mathrm{~m} / \mathrm{seg}= \) c. Distancia Tierra-Sol \( =1.5 \times 10^{9} \mathrm{~km}= \) d. Masa de la Tierra \( =5.98 \times 10^{24} \mathrm{~kg}= \) e. Distancia Tierra-Luna \( =3.8 \times 10^{5} \mathrm{~km}= \) १. Masa de la Luna \( =7.36 \times 10^{22} \mathrm{~kg}= \)

Find the greatest common factor of these three expressions. \[ 15 x^{5}, 35 x^{2} \text {, and } 3 x^{3} \]