Solve the problem.A plane flies 440 miles with the wind and 320 miles against the wind in the same length of time. If the speed of the wind is 21 mph, what is the speed of the plane in still air?
A. 138 mph
B. 123 mph
C. 133 mph
D. 158 mph
Answer: C
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Use the range rule of thumb to approximate the standard deviation.The heights in feet of people who work in an office are as follows. Round results to the nearest tenth.5.9 5.7 5.5 5.4 5.6 5.9 5.8 6.2 6.0 5.9
A. 0.1 B. 1.2 C. 0.5 D. 0.2
Use the given matrices to compute the given expression.Let B = 
. Find -2B.
A. 
B. 
C. 
D. 
Find a value of ? in [0°, 90°] that satisfies the statement. Leave answer in decimal degrees rounded to seven decimal places, if necessary.cot ? = 1.5443661
A. 57.0763431° B. 40.3544940° C. 49.6455060° D. 32.9236568°
Describe the behavior of the function below as x approaches zero.
?
?
A. f ? 0 as x ? 0. B. f ? -1 as x ? 0. C. f ? 1 as x ? 0. D. f ? -? as x ? 0. E. f ? +? as x ? 0.