Use front-end rounding to round each number. Then, add or subtract the rounded numbers to get an estimated answer. Finally, find the exact answer.estimate exact
A. Estimate: 15; exact: 15.2423
B. Estimate: 15; exact: 15.2523
C. Estimate: 16; exact: 16.2423
D. Estimate: 17; exact: 16.2523
Answer: D
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Calculate the work done by the force F along the path C.F = xyi + 4j + 8xk; C: r(t) = cos 7ti + sin 7tj + tk, 0 ? t ? 
A. W = 
B. W = 
C. W = 0
D. W = 
Perform the indicated operations. Write the result using only positive exponents. Assume all variables represent nonzero real numbers.
A. 
B. -315
C. 
D. 
Multiply the conjugates. Assume all variables have nonnegative values.(
+ y)(
- y)
A. x - 2y
B. 13x - y2
C. 14x
D. x + 2y
Find the probability.The distribution of B.A. degrees conferred by a local college is listed below, by major. Major FrequencyEnglish2073Mathematics2164Chemistry318Physics856Liberal Arts1358Business1676Engineering 8689313What is the probability that a randomly selected degree is in English or Mathematics? Round your answer to three decimal places.
A. 0.424 B. 0.517 C. 0.010 D. 0.455