Solve the problem.Suppose the cost per ton, y, to build an oil platform of x thousand tons is approximated by 
What is the cost per ton for 
A. $378.79
B. $1437.50
C. $1562.50
D. $12.50
Answer: A
Mathematics
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Provide an appropriate response.The expression 
contains parentheses. Are they necessary? Explain.
What will be an ideal response?
Mathematics
Determine the vertex, focus, and directrix of the parabola and sketch its graph.x2 - 6x + 4y + 21 = 0
A. vertex: (3, -3)
focus: (2, -3)
directrix: x = 4
B. vertex: (3, -3)
focus: (4, -3)
directrix: x = 2
C. vertex: (3, -3)
focus: (3, -4)
directrix: y = -2
D. vertex: (3, 3)
focus: (3, 2)
directrix: y = 4
Mathematics
Multiply or divide as indicated. Write the answer in lowest terms.
÷ 
A. 
B. 
C. 
D. 
Mathematics
Multiply and simplify.
? 
A. 
B. 
C. 
D. 15x6
Mathematics