Solve the problem.A piece of cardboard is twice as long as it is wide. It is to be made into a box with an open top by cutting 2 cm squares from each corner and folding up the sides. Let x represent the width of the original piece of cardboard. Find the width of the original piece of cardboard, x, if the volume of the box is 2300 cm3.
A. 23 cm
B. 28 cm
C. 26 cm
D. 27 cm
Answer: D
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Solve the problem.For the study described below, identify the sample statistic.A bank manager wants to know the average amount of time customers of his bank have to wait in line. 300 customers were polled and asked their average wait time at the bank.
A. The percentage of dissatisfied customers among all of the bank's customers. B. The average wait time for all of the bank's customers C. The 300 people polled D. The average wait time for the 300 customers polled
Write a polar equation in r and ? of a hyperbola with the focus at the origin, with the eccentricity 7 and directrix r = -12csc?.
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Use multiplication to check the answer. If an answer is incorrect, find the correct answer.
A. Incorrect; should be 3729 B. Correct C. Incorrect; should be 3730 R1 D. Incorrect; should be 3730 R2
Solve the problem.The amount of a radioactive substance present, in grams, at time t in months is given by the formula 
Find the number of grams present in 4 years. If necessary, round to three decimal places.
A. 0.324 B. 304.693 C. 3046.927 D. 0.032