Simplify. Assume that all variables represent any real number.
A. 
B. -x - 3
C. x + 3
D. -
Answer: A
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First use front-end rounding to write an estimate of the answer, and then add the decimals to obtain an exact answer.EstimateProblem
? 
A. Estimate: 59, exact: 55.67 B. Estimate: 59, exact: 65.67 C. Estimate: 60, exact: 66.67 D. Estimate: 59, exact: 64.67
Solve the problem.The number of bacteria growing in an incubation culture increases with time according to 
where x is time in days. Find the number of bacteria when 
and 
.
A. 2400 bacteria; 36,000 bacteria B. 7200 bacteria; 583,200 bacteria C. 2400 bacteria; 583,200 bacteria D. 2400 bacteria; 64,800 bacteria
Use only the graph of 
to find the x-intercepts of the graph and the solutions of the equation 
-x2 - 2x + 48 = 0
A. x-intercepts: (6, 0) and (-8, 0) solutions: 6, -8 B. x-intercepts: (0, 6) and (0, -8) solutions: 6, -8 C. x-intercepts: (0, 6) and (0, -8) solutions: 6, 8 D. x-intercepts: (-6, 0) and (8, 0) solutions: -6, 8
Factor completely, or state that the polynomial is prime.5y4 - 25y3 + 6y2 - 30y
A. y(y - 5)(5y2 - 6) B. prime C. y(y + 5)(5y2 + 6) D. y(y - 5)(5y2 + 6)