Provide an appropriate response.It can be shown that the inequalities -x ? x cos
? x hold for all values of x ? 0.Find 
x cos
if it exists.
A. does not exist
B. 1
C. 0.0007
D. 0
Answer: D
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Find the average value of the function f over the given region.f(x, y) = 6x + 2y over the triangle with vertices 
, 
, and 
A. 
B. 20
C. 17
D. 14
Perform the indicated operation.For a heat-seeking rocket in pursuit of an aircraft, the distance d (in km) from the rocket to the aircraft is 
, where t is the angle shown in the figure. Find d to two decimal places for t = 120°.
A. 306.19 B. 166.67 C. 379.92 D. 1046.93
Convert the temperature. Give your answer to the nearest tenth of a degree.-34°C = °F
A. -61.2°F B. -29.2°F C. 36.7°F D. -18.9°F
Solve problems using a calculator.A local water district purchased its annual supply of water from three different sources. The number of acre-feet purchased and the cost per acre-foot for each source are shown in the following table. Calculate the average cost of water per acre-foot. (Round to the nearest dollar, if necessary.)Source Number of Acre-Feet Cost per Acre-FootReservoir X 1109 $649Well Water 2740 $208State Water 4775 $2896
A. $1748.62 per acre-foot B. $1753.02 per acre-foot C. $1752.98 per acre-foot D. $1747.14 per acre-foot