Decide if the answer is reasonable or unreasonable by rounding the numbers and estimating the answer. If the answer is not reasonable, find the correct answer.771.3 ÷ 4.6 = 16.77
A. Reasonable
B. Unreasonable, should be 167.7
C. Unreasonable, should be 1677
D. Unreasonable, should be 1.677
Answer: B
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Using the exponential key of a calculator to find an approximation to the nearest thousandth.162.2
A. 445.722 B. 301,136.15 C. 35.2 D. 256
Find the order of the matrix product AB and the product BA, whenever the products exist.A is 4 x 2, B is 2 x 4.
A. AB is 2 x 2, BA is 4 x 4. B. AB is 4 x 4, BA is nonexistent. C. AB is nonexistent, BA is 2 x 2. D. AB is 4 x 4, BA is 2 x 2.
Solve the problem.A study was conducted to compare the average time spent in the lab each week versus course grade for computer students. The results are recorded in the table below. By using linear regression, the following equation is obtained: 
where x is the number of hours spent in the lab and y is grade on the test. Use this equation to predict the grade of a student who spends 8 hours in the lab. Number of hours spent in lab Grade (percent) 10 96 11 51 16 62 9 58 7 89 15 81 16 46 10 51
A. 80.6 B. 73.7 C. 69.7 D. 75.3
Find the indicated matrix product or state that the product is undefined.A = 
, B = 
AB
A. 
B. 
C. 
D. 