Find the largest open interval where the function is changing as requested.Increasing f(x) = 
x2 - 
x
A. (-?, -1)
B. (1, ?)
C. (-1, 1)
D. (-?, ?)
Answer: B
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Set up the general equation from the given statement.r varies jointly as s and t.
A. r = kst
B. r = 
C. r = kd + kt
D. r = kd + t
Use factoring techniques to solve the quadratic equation.(x + 4)(x - 3) = x + 4
A. {-4} B. {-4, 3} C. {-4, 4} D. {4}
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. Use the equation of the least squares line to predict the grade of a student who spends 20 hours in the lab. Number of hours spent in lab (x) Grade (percent) (y) 10 96 11 51 16 62 9 58 7 89 15 81 16 46 10 51
A. 47.4% B. 55.4% C. 51.4% D. 68.6%
Find the indicated matrix.Let A = [-1 2] and B = [1 0]. Find 3A + 4B.
A. [2 2] B. [1 6] C. [-3 4] D. [-1 4]