Solve the problem.When the angle of elevation of the sun is ?, a tree casts a shadow. Write a formula which expresses the length of the tree's shadow, y, as a function of the angle ? and the height of the tree, x.
A. y = x cos ?
B. y = x tan ?
C. y = 
D. y = x cot ?
Answer: D
Mathematics
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Provide an appropriate response.The doubling time of a city's population is 15 years. How long does it take for the population to quadruple.
A. 4 years B. 215 years C. 154 years D. 30 years
Mathematics
Find the equation of the graphed line.
A. y = - x + 6 B. y = - x - 6 C. y = x + 6 D. y = x - 6
Mathematics
Convert as indicated. Express the answer in decimal form when needed.9 miles per day to miles per hour
A. 216 mi/hr B. 540 mi/hr C. 63 mi/hr D. 108 mi/hr
Mathematics
Solve the problem. Write ratios in lowest terms.A certain lake is 1300 feet deep. A nearby lake is 1000 feet deep. Write the ratio of the first lake's depth to the second lake's depth.
A. 
B. 
C. 
D. 
Mathematics