Multiply and simplify.
? 
A. 2
B. 2
C. 
D. 
Answer: A
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Match the vector equation with the correct graph.
r(t) = (1 - t2)j + 3tk; -1 ? t ? 1
A. Figure 7 B. Figure 8 C. Figure 2 D. Figure 4
Find the product.(29)(-49)
A. -1450 B. -1521 C. -1421 D. 1421
Solve.Ultraviolet radiation from the sun is thought to be one factor causing skin cancer. The amount of UV radiation a person receives is a function of the thickness of the earth's ozone layer which depends on the latitude of the area where the person lives. The following data represent the latitudes and melanoma rates for nine randomly selected areas in the United States. The melanoma rates refer to a three-year period. 
Graph the data on a scatter diagram treating latitude as the independent variable. Find an equation of the line containing the points 
/> and 
Express the relationship using function notation. Graph the line on the scatter diagram. Interpret the slope of the line. Use the line to predict the melanoma rate of an area with a latitude of 35.8 degrees north. 
What will be an ideal response?
Solve the problem.If an automobile is traveling at velocity V (in feet per second) , the safe radius R for a curve with superelevation ? is given by the formula 
where f and g are constants. A road is being constructed for automobiles traveling at 49 miles per hour. If 
and 
calculate R. Round to the nearest foot. (Hint: 1 mile =
5280 feet) A. R = 1161 ft B. R = 731 ft C. R = 695 ft D. R = 711 ft