Solve the problem.To approximate the speed of a river, a circular paddle wheel with radius 0.63 feet is lowered into the water. If the current causes the wheel to rotate at a speed of 9 revolutions per minute, what is the speed of the current? If necessary, round to two decimal places.
A. 35.63 mph
B. 0.4 mph
C. 0.2 mph
D. 0.06 mph
Answer: B
Mathematics
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Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.Use the tables to find (fg)(-9).
A. -24 B. -4 C. 81 D. -36
Mathematics
A skydiver leaps from a helicopter hovering high above the ground. Her velocity t sec later and before deploying her parachute is given by
where v (t) is measured in meters per second. What is her terminal velocity? Hint: Evaluate 
.
a. 54 m/sec
b. 8.1 m/sec
c. 87 m/sec
d. 62.1 m/sec
Mathematics
Transform the equation into standard form. Identify the curve and graph it.
x² + y² – 4x – 2y – 4 = 0
Mathematics