Provide an appropriate response.A student wanted to estimate 21.5 × 0.0079 by first rounding each number. He solved the problem as follows.21.5 × 0.0079 is approximately equal to 
which is equal to 0.016. So he estimated the answer as 0.016. Do you agree with the answer? If not, explain where the student went wrong and give the correct answer.
What will be an ideal response?
Answers will vary. Possible answer: 20 × 0.008 is equal to 0.16, not to 0.016. His estimate should have been 0.16.
Mathematics
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Solve each of the following systems of equations. If the system is inconsistent or dependent, say so.5x - 2y = -137x + 2y = -23
A. (1, -3) B. (-3, -1) C. (-1, -3) D. (3, -1)
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Solve the inequality and graph the solution set.1 ? 2x + 5 and 4x - 1 < 7
A. 
B. 
C. 
D. 
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Find the values of x for which the expression is a real number.
A. (-?, 20) B. [20, ?) C. (20, ?) D. (-?, 20]
Mathematics