The vector r(t) is the position vector of a particle at time t. Find the angle between the velocity and the acceleration vectors at time t = 0.r(t) = e2ti + (9 + e-2t)j + (8 cos 7t)k
A. 0
B. 
C. 
D. 
Answer: C
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Estimate the indicated probability.The table shows the number of college students who prefer a given pizza topping.
Determine the empirical probability that a student prefers meat toppings. Round to the nearest thousandth.
A. 0.336 B. 0.324 C. 0.109 D. 0.327
Solve the problem.Walt made an extra $7000 last year from a part-time job. He invested part of the money at 7% and the rest at 6%. He made a total of $450 in interest. How much was invested at 6%?
A. $3500 B. $3000 C. $5000 D. $4000
Solve the problem.A pulley with a diameter of 20 inches is driven by a belt which is moving 1231 feet per minute. To the nearest unit, how many revolutions per minute are made by the pulley?
A. 247 revolutions per min B. 333 revolutions per min C. 340 revolutions per min D. 235 revolutions per min
Use a formula to solve the problem.What is the perimeter of a rectangle of length 10 ft and width 10 ft?
A. 20 ft B. 30 ft C. 40 ft D. 80 ft