Salma is at the top of a cliff looking down at Rico’s boat. They both have Global Positioning System (GPS) devices and are communicating via cell phones. They determine that Rico’s boat is 5.0 km from a point on the shore directly below Salma, and 6.0 km from Salma herself. a) Draw a diagram to represent this situation and label the given information. b) Find the angle of depression at which Salma is viewing Rico’s boat. c) Find the height of the cliff.

Determine the values displayed by each cout statement in the following program:

#include <iostream>
using namespace std;
int firstnum = 10;  // declare and initialize a global variable
void display();     // function prototype
int main() {
    int firstnum = 20;  // declare and initialize a local variable
    cout << "\nThe value of firstnum is " << firstnum << endl;
    display();
    return 0;
}
void display(void) {
    cout << "The value of firstnum is now " << firstnum << endl;
    return;
}

The table gives the gross world product, G, which measures global output of goods and services. If t is in years since 1950, the regression line for these data is $G=3.543+0.734 t$.

$$\begin{array}{|c|ccccccc|} \hline \text { Year } & {1950} & {1960} & {1970} & {1980} & {1990} & {2000} \\ \hline G & {6.4} & {10.0} & {16.3} & {23.6} & {31.9} & {43.2} \\ \hline \end{array}$$

Interpret the slope of the line in terms of gross world product.

Due to their zero ozone depletion and low global warming potential natural refrigerants are actively under consideration for commercial refrigeration applications. Investigate the viability of natural refrigerants in systems to improve human comfort and safeguard food. Consider performance benefits, safety, and cost. On the basis of your study, recommend especially promising natural refrigerants and areas of application where each is particularly well suited. Report your findings in a PowerPoint presentation

Based on the way it is used in this passage, what do you think is the closest synonym for arable? a. free b. dry c. infertile d. fertile Analysts disagree about whether the shift in agricultural locations due to global climate change will raise or lower global agricultural output. Because many nations in higher latitudes are more developed and are more equipped to have higher rates of productivity, more food ought to be produced. On the other hand, much of the arable land in these wealthier nations may have already been developed as urban areas, so some food-production potential may not be realized. If crops shift locations, poorer nations may become even weaker economically.The gap between rich and poor nations may grow even wider as developing nations become subject to even harsher environmental conditions for growing crops. However, these nations could make positive adaptations, such as increasing use of water-conserving irrigation techniques and cultivating crops that need less water.

According to Global Research News (Mar. 4, 2014), one-fourth of all rough diamonds produced in the world are blood diamonds. (Any diamond that is mined in a war zone - often by children - in order to finance a warlord's activity, an insurgency, or an invading army's effort is considered a blood diamond.) Also, 90% of the world's rough diamonds are processed in Surat, India, and of these diamonds, one-third are blood diamonds. Find the probability that a rough diamond is not a blood diamond.

A meteorologist preparing a talk about global warming compiled a list of weekly low temperatures (in degrees Fahrenheit) he observed at his southern Florida home last year. The coldest temperature for any week was

$$36 ^ { \circ } \mathrm { F }$$

, but he inadvertently recorded the Celsius value of

$$2 ^ { \circ }$$

. Assuming that he correctly listed all the other temperatures, explain how this error will affect these summary statistics: measures of center: mean and median.

(II) At a given latitude, ocean water in the so-called mixed layer (from the surface to a depth of about $50 \mathrm{~m}$ ) is at approximately the same temperature due to the mixing action of waves. Assume that because of global warming, the temperature of the mixed layer is everywhere increased by $0.5^{\circ} \mathrm{C}$, while the temperature of the deeper portions of the ocean remains unchanged. Estimate the resulting rise in sea level. The ocean covers about $70 \%$ of the Earth's surface.

Global Airlines randomly chose 10 passengers from today's 9 a.m. Chicago-Tampa trip as part of their customer service programme. Each sampling traveller will be questioned on the services, amenities, and other aspects of the airport. Each passenger received a number when they boarded the aircraft in order to choose the sample. The range of numbers ranged from 001 to 250. Select 10 usable numbers at random using Appendix B.4.

Consider the production of gold during the California gold rush (1848–1888). The production of gold can be modeled by $G(t)=\frac{(25 t)}{\left(t^{2}+16\right)},$ where t is the number of years since the rush began $(0 \leq t \leq 40)$ and G is ounces of gold produced (in millions). Find when the maximum (local and global) gold production occurred, and the amount of gold produced during that maximum.

Consider the production of gold during the California gold rush (1848–1888). The production of gold can be modeled by $G(t)=\frac{(25 t)}{\left(t^{2}+16\right)},$ where t is the number of years since the rush began $(0 \leq t \leq 40)$ and G is ounces of gold produced (in millions). Find when the minimum (local and global) gold production occurred. What was the amount of gold produced during this minimum?

In 2005, Frederick Blattner and his colleagues found that E. coli have a global transcriptional program that helps them "forage" for better sources of carbon. Many genes, including genes needed for bacterial motility, are turned on in response to poorer carbon sources so that the bacteria can search for better nutrition. You now want to search for genes that regulate this response. How could you use lacZ fusions to try to identify such regulatory genes?

In natural circumstances, accumulated reserves of carbon such as peat, coal and oil represent a sink or natural diversion from the cycle. Eventually, the carbon in these sinks returns to the cycle through the action of geological processed which return deposits to the surface for oxidation. (a) What is the effect of human activity on the amount of carbon stored in sinks? (b) Describe two global effects resulting from this activity: (c) What could be done to prevent or alleviate these effects?

Sunspots alter the amount of energy Earth gets from the Sun, but not enough to impact global climate change, a new study suggests. The Sun's role in global warming has long been a matter of debate and is likely to remain a contentious topic.Scientists have pondered the link between the Sun and Earth's climate since the time of Galileo. There has been an intuitive perception that the Sun's variable degree of brightness-the coming and going of sunspots for instance-might have an impact on climate. Most climate models already incorporate the effects of the Sun's waxing and waning power on Earth's weather. The number of spots cycles over time, reaching a peak every 11 years, but sunspotdriven changes to the Sun's power are too small to account for the climatic changes observed in historical data. The difference in brightness between the high point of a sunspot cycle and its low point is less than $0.1$ percent of the Sun's total output.

Approximately how much does a sunspot cycle change the energy output of the Sun?

A. 11 percent

B. $1.0$ percent

C. $0.1$ percent

D. $0.01$ percent