Solve the problem.The Epson Stylus 850 can print Helen's class project in 24 minutes. The Epson Stylus 500 can print the project in 42 minutes. If the two printers work together, how long would they take to print out the project?
A. 
min
B. 168 min
C. 15
min
D. 11 min
Answer: C
Mathematics
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Perform the indicated operation without the use of a calculator and express each answer in scientific notation.
A. 3 × 10-11 B. 3 × 10-5 C. 3 × 1011 D. 3 × 105
Mathematics
Graph the function.y = -3 cos x
A. 
B. 
C. 
D. 
Mathematics
Factor completely. If a polynomial cannot be factored, say it is prime.2x2 - 12x + 2x3
A. (2x2 + 4x)(x - 3) B. 2x(x + 2)(x - 3) C. (x - 2)(2x2 + 6) D. 2x(x - 2)(x + 3)
Mathematics
Sketch the graph of the quadratic function. Identify the vertex and axis of symmetry.f(x) = (x + 1)2 - 9
A. vertex: (1, - 9)
axis of symmetry: x = 1
B. vertex: (1, - 9)
axis of symmetry: x = 1
C. vertex: (- 1, - 9)
axis of symmetry: x = - 1
D. vertex: (- 1, - 9)
axis of symmetry: x = - 1
Mathematics