Find the center of mass of the wire that lies along the curve r and has density ?.r(t) = (3t2 - 1)i + 6tk, -1 ? t ? 1; 
A. 
B. 
C. 
D. 
Answer: A
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Solve the equation.
- 
= 
A. 2, -2 B. no solution C. 2 D. -2
Subtract.- 
A. 1,590.49167 B. 1,590.49177 C. 1,590.49168 D. 1,590.49267
Solve the problem.The formula 
can be used to estimate the speed of a car, v, in miles per hour, based on the length, L, in feet, of its skid marks upon sudden braking on a dry asphalt road. If a car is involved in an accident and its skid marks measure 245 feet, at what estimated speed was the car traveling when it applied its brakes just prior to the accident?
A. 70 miles per hour B. 65 miles per hour C. 80 miles per hour D. 75 miles per hour
Solve.The Booster Club sells hot dogs, tacos, cheeseburgers, or pizza with milk, cola, root beer, tea, or lemonade at a football game. How many different 1-food/1-drink combinations can you order?
A. 24 B. 22 C. 10 D. 20