Multiply using the rule for finding the product of the sum and difference of two terms.
A. 9x2 - 
x + 
B. 9x2 - 
C. 9x2 - 
D. 9x2 - 
x - 
Answer: B
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The position vector of a particle is r(t). Find the requested vector.The acceleration at t = 
for r(t) = (2 sin 5t)i - (10 cos 5t)j + (9 csc 5t)k
A. a
= -50i - 225k
B. a
= 50i + 225k
C. a
= 250j + 225k
D. a
= -50i + 225k
Write an equivalent double integral with the order of integration reversed.
A. 
B. 
C. 
D. 
Find the x- and y-intercepts of the graph of the given equation, if they exist. Then graph the equation.2y = 
x
A. x: 0; y: 0
B. x: 0; y: 0
C. x: 0; y: 0
D. x: 0; y: 0
Express the exercise as a system of linear equations, then find the solution. Use a calculator where appropriate.A barge takes 2 hours to move (at a constant rate) downstream for 16 miles, helped by a current of 3 miles per hour. If the barge's engines are set at the same pace, find the time of its return trip against the current.
A. 8 hr B. 2 hr C. 32 hr D. 5 hr