A container contains a large unspecified number of ping-pong balls. A student takes 80 balls from the container, marks them with a blue dot, returns the marked balls to the container, and thoroughly mixes the balls. She then takes 80 balls again from the container. Of these, 16 have blue dots. She now wants to use this data to estimate the total number of ping-pong balls in the container.An estimate for the number of ping-pong balls in the container is
A. 400.
B. 480.
C. 160.
D. 576.
E. none of these
Answer: A
Mathematics
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Solve the given differential equation. (The form of yp is given.)25D2y - y = sin x (Let yp = A sin x + B cos x.)
A. y = c1ex/5 + c2e-x/5 - 
sin x
B. y = c1ex/5 + c2e-x/5 - 
cos x
C. y = c1ex/5 + c2e-x/5 + 
sin x
D. y = c1ex/5 + c2e-x/5 - 
sin x + 
cos x
Mathematics
Write fraction as decimal number. Use bar notation for repeating decimals.
A. 0.
B. 0.
C. 0.75
D. 0.7
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Determine the component representation and magnitude of the vector having the initial point P and the terminal point Q.P(5, 1) and Q(11, 6)
A. 
, 61
B. 
, 
C. 
, 
D. 
, 61
Mathematics
Multiply or divide as indicated. Write the answer in lowest terms.
÷ 6
A. 
B. 
C. 
D. 
Mathematics