Find the length of the indicated portion of the curve.r(t) = (etcos t)i + (etsin t)j + 7etk, -ln 2 ? t ? 0
A. 
B. 
C. 
D. 
Answer: B
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Solve the problem.The area of a circle with radius r is given by the function A(r) = ?r2. Find the area of the base of a circular storage tank if the radius is 5 feet long. Use ? ? 3.14.
A. 78.5 square feet B. 15.7 square feet C. 31.4 square feet D. 75 square feet
Perform the indicated operation by first expressing each number in scientific notation. Write answer in scientific notation.(260,000,000)(2,000,000,000)
A. 5.2 × 1016 B. 5.2 × 1017 C. 5.2 × 1018 D. 5.2 × 1015
Add. -23 + 23
A. 1 B. 46 C. -46 D. 0
Solve the problem.The cost of manufacturing a molded part is related to the quantity produced during a production run. When 100 parts are produced, the cost is $300. When 400 parts are produced, the cost is $2100. What is the average cost per part?
A. $4.50 per part B. $0.17 per part C. $6.00 per part D. $7.00 per part