Solve the problem.If a rock falls from a height of 60 meters on Earth, the height H (in meters) after x seconds is approximately H(x) = 60 - 4.9x2.When does the rock strike the ground? Round to the nearest hundredth, if necessary.
A. 3.5 sec
B. 1.58 sec
C. 2.5 sec
D. 12.24 sec
Answer: A
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Simplify. Write your answers in the form of a+bi, where a and b are real numbers.
+ 
A. 
+ 
i
B. - 
+ 
i
C. 
- 
i
D. - 
- 
i
Perform the indicated operation. Write the answer in simplest form. If the answer is an improper fraction, write it as a mixed number.6
÷ 
A. - 1
B. 1
C. 1
D. - 1
Solve the problem.The average cost per unit, y, of producing x units of a product is modeled by
Describe the company's production level so that the average cost of producing each unit does not exceed 
.
A. Not more than 200,000 units B. At least 300,000 units C. At least 200,000 units D. Not more than 300,000 units
Solve the problem.Decide which of the rational functions might have the given graph. 
A. f(x) = 1 - x
B. f(x) = 
- 1
C. f(x) = 1 - 
D. f(x) = 1 + 