Using the variable x, write the interval using set-builder notation.
A. 
B. 
C. 
D. {x| 5 ? x ? 8}
Answer: C
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Use a graphing calculator to solve the system of equations. Round your solutions to one decimal place.1.4x - 0.5y - 5.0z = 2.73.4x - 6.3y - 1.3z = -3.23.7x - 1.5y - 1.7z = 9.6
A. (14.8, 9.8, 1.0) B. (7.4, 4.9, 0.5) C. (3.7, 2.5, 0.3) D. (18.5, 12.3, 1.3)
A merchant plans to sell two models of MP3 players at prices of $225 and $250. The $225 model yields a profit of $30 per unit and the $250 model yields a profit of $31 per unit. The merchant estimates that the total monthly demand will not exceed 280units. The merchant does not want to invest more than $55,776 in inventory for these products. What is the optimal inventory level for each model? What is the optimal profit? ?
A. 231 units of the $225 model49 units of the $250 modelOptimal profit: $8,449 B. 225 units of the $225 model30 units of the $250 modelOptimal profit: $7,680 C. 250 units of the $225 model31 units of the $250 modelOptimal profit: $8,461 D. 275 units of the $225 model30 units of the $250 modelOptimal profit: $9,180 E. 275 units of the $225 model31 units of the $250 modelOptimal profit: $9,211
Solve the inequality. Write the solution set in interval notation.5(7x + 1) - 5 < 7(5x - 8) + 8
A. (-?, -48)
B. (-?, ?)
C. 
D. ?
Graph the pair of functions on the same plane. Use a dashed line for g(x).f(x) = 
, g(x) = -4
A. 
B. 
C. 
D. 