Round the numbers so that there is only one non-zero digit, and estimate the answer. Then perform the indicated operation to find the exact answer.28.1 × 1.9
A. estimate: 53
B. estimate: 6
C. estimate: 60
D. estimate: 50
Answer: C
Mathematics
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Evaluate the integral by changing the order of integration in an appropriate way.
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.A rancher has 3280 feet of fencing that will fence off a rectangular grazing pen for cattle. One edge of the pen borders a straight creek and will need no fence. If the edges of the pen perpendicular to the creek are x feet long, write a completely factored polynomial whose values give the area of the pen.
A. 2x(840 - x) B. 2x(1640 + x) C. 2x(840 + x) D. 2x(1640 - x)
Mathematics
Multiply.
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?
A. ?
B. ?
C. ?
D. ?
E. ?
Mathematics
Solve the inequality. Express your answer using interval notation.x + 1 < 8
A. (-?, 7)
B. (-?, 7]
C. (7, ?)
D. (-?, 9)
Mathematics