Evaluate the integral.
A. - 
B. 
C. - 
D. 
Answer: C
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Solve the problem.To find the speed of a free-falling skydiver we use the formula s = v - 32t, where s is the speed of the skydiver, v is the initial velocity, and t is the time since the start of the free fall. Find the speed of a skydiver at time t = 2 seconds if her initial downward velocity (v) is -8 feet per second.
A. -72 ft/sec B. -56 ft/sec C. 258 ft/sec D. -64 ft/sec
Solve the system by the elimination method.x + y = 10x - y = 4
A. ? B. {(6, 4)} C. {(-7, 4)} D. {(7, 3)}
Solve the problem.Halley's comet has an elliptical orbit with the sun at one focus. Its orbit shown below is given approximately by 
In the formula, r is measured in astronomical units. (One astronomical unit is the average distance from Earth to the sun, approximately 93 million miles.) 
Find the distance from Halley's comet to the sun at its shortest distance from the sun. Round to the nearest hundredth of an astronomical unit and the nearest million miles.
A. 5.36 astronomical units; 499 million miles B. 585 astronomical units; 54,405 million miles C. 5.31 astronomical units; 494 million miles D. 10.72 astronomical units; 997 million miles
Round the following decimal to the nearest hundredth. ? 670.311 ?
A. 670.5 B. 670.31 C. 670.312 D. 670.32 E. none of the above