What evidence indicates that some asteroids once had geologically active surfaces?

Write T (true) or F (false) for the following statement.

Semicolons and colons are always placed outside closing quotation marks.

Washington County’s Board of Representatives is considering the construction of a longer runway at the county airport. Currently, the airport can handle only private aircraft and small commuter jets. A new, long runway would enable the airport to handle the midsize jets used on many domestic flights. Data pertinent to the board’s decision appear below.

$$\begin{array}{lr} \text{Cost of acquiring additional land for runway } &\$\hspace{5pt} 70,000\\ \text{Cost of runway construction} &200,000\\ \text{Cost of extending perimeter fence} & 29,840\\ \text{Cost of runway lights} &39,600\\ \text{Annual cost of maintaining new runway} &28,000\\ \text{Annual incremental revenue from landing fees} &40,000\\ \end{array}$$

In addition to the preceding data, two other facts are relevant to the decision. First, a longer runway will require a new snowplow, which will cost $100,000. The old snowplow could be sold now for$10,000. The new, larger plow will cost $12,000 more in annual operating costs. Second, the County Board of Representatives believes that the proposed long runway, and the major jet service it will bring to the county, will increase economic activity in the community. The board projects that the increased economic activity will result in$64,000 per year in additional tax revenue for the county.

In analyzing the runway proposal, the board has decided to use a 10-year time horizon. The county’s hurdle rate for capital projects is 12 percent.

Required:

1. Prepare a net-present-value analysis of the proposed long runway.

2. Should the County Board of Representatives approve the runway?

3. Which of the data used in the analysis are likely to be most uncertain? Least uncertain? Why?

Explain how scientists know that the Moon was once geologically active.

Expand.

$$( x - 11 ) ^ { 2 }$$

Evaluate the derivatives of the given functions at the given points.

$$3x^3 y^2 - 2y^3 = -4; (1, 2)$$

The data is below:

$$\begin{array}{r|rrrrr} x_i & 2 & 6 & 9 & 13 & 20 \\ \hline y_i & 7 & 18 & 9 & 26 & 23 \end{array}$$

The estimated regression equation for these data is $\hat{y}=7.6+.9 x$. What percentage of the total sum of squares can be accounted for by the estimated regression equation? What is the value of the sample correlation coefficient?

Choose the correct answer.

Management is (a) adverse, (b) averse to any decrease in employee health benefits.

Graph each function over the interval $[-2 \pi, 2 \pi]$. Explain how the graphs are transformations of $y=\sin x$ or $y=\cos x$.

$$g(x)=3 \cos \left(x+\frac{\pi}{4}\right)$$

Draw the trajectories of seven rays that leave the object heading toward the seven dots on the boundary. Assume $n_2<n_1$ and $\theta_{{c}}=45^{\circ}$.

Indicate whether the following statement is true (T) or false (F).

Semicolons and colons are always placed before closing quotation marks.

Use proofreading marks to correct any capitalization errors in the following sentence. Indicate the total number of changes at the right.

Google was originally named googol; however, an investor made a check out to "Google, inc.," and this typo became the Company's name. _________

The vertices of a triangle are A(2, 5), B(1, 2), and C(3, 1). Find the coordinates of the image after the transformations given. Reflect in the x-axis, and then rotate $90^{\circ}$ counterclockwise about the origin.

Use proofreading marks to correct any capitalization errors in the following sentence. Indicate the total number of changes at the right.

Regulations of the sarbanes-oxley act of 2002 resulted in costly expenses for our Company. _________