Solve the system by graphing. 3x + 5y = 31 3x + 3y = 21
A. x = 2, y = 5
B. x = 3, y = 12
C. no solution
D. x = 5, y = 2
Answer: A
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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
Write the expression with only positive exponents. Assume all variables represent nonzero numbers. Simplify if necessary.r-7
A. r1/7
B. -r7
C. - 
D. 
Solve.A stock broker is paid 
per month plus 
of the total sales of stocks that she sells. Last month Joan sold $460,000 worth of stock. What was her total income for the month?
A. $32,200 B. $322,000 C. $32,700 D. $322,500
Find the indicated intercept(s) of the graph of the function.x-intercepts of f(x) = 
A. (5, 0) B. (-2, 0), (2, 0) C. (2, 0) D. (- 8, 0)