Find the difference.-13 - (-3)
A. -16
B. 10
C. 16
D. -10
Answer: D
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Find the solution to the system of equations. Round the answer to five decimal places.x -2y - 4z = -12.86296-x + 2y + z = 5.600413x +y - z = 4.89717
A. x = 0.61634, y = 2.60851, z = 2.42085 B. x = 1.63664, y = 2.4081, z = 2.42085 C. x = 0.61634, y = 2.4081, z = 2.11065 D. x = 1.63664, y = 2.60851, z = 2.11065
Find the probability.When a single card is drawn from an ordinary 52-card deck, find the probability of getting a red card.
A. 
B. 
C. 
D. 2
Use the vertex and intercepts to sketch the graph of the quadratic function.f(x) = 8 - x2 - 2x 
A. 
B. 
C. 
D. 
Solve the problem.Bob owns a watch repair shop. He has found that the cost of operating his shop is given by 
, where c is cost and x is the number of watches repaired. How many watches must he repair to have the lowest cost?
A. 82 watches B. 41 watches C. 40 watches D. 46 watches