Estimate the sum or difference by rounding each number to the nearest ten.
A. 230
B. 210
C. 200
D. 225
Answer: B
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Provide an appropriate response.Find the greatest common factor of 42, 84, and 210.
A. 14 B. 21 C. 7 D. 42
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 function is obtained: 
where x is the number of hours spent in the lab and y is grade on the test. Use this function to predict the grade of a student who spends 19 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. 69.6 B. 57.1 C. 53.3 D. 49.3
Find the intercepts for the graph of the equation.4x + y = 8
A. (8, -8) (4, 8) B. (2, 0) (0, 8) C. (4, 0) (-8, 0) D. (0, 4) (0, -8)
Simplify the expression.-5
+ 
- 2
- 3
A. -9
B. -3
- 5
C. -4
- 5
D. -4
- 1