Suppose that, for a certain exam, a teacher grades on a curve. It is known that the mean is 55 and the standard deviation is 7. There are 50 students in the class. What score would be necessary to obtain a C?
?
?
A. 48 or above
B. 62 or above
C. 50 or above
D. 44 or above
E. 42 or above
Answer: A
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Determine the type of curve from the given information.The path of a planet revolving around the sun is a conic with the sun at one of the two foci. What type of curve is this?
A. Hyperbola B. Circle C. Ellipse D. None of the above
Solve the problem.The time t, in minutes, needed for clothes hanging on a line outdoors to dry, at a specific temperature and wind speed, depends on the humidity, h. The time can be approximated by the equation 
where h is the humidity expressed as a decimal number. Find the length of time required for clothing to dry if there is 31% humidity. Round your answer to 2 decimal places.
A. 64.99 min B. 65.78 min C. 63.56 min D. 66.22 min
Provide an appropriate response.Factor by grouping: 6x2 + 17x - 10
A. (6x - 5)(x + 2) B. (2x - 1)(3x + 10) C. (2x + 1)(3x - 10) D. (6x + 5)(x - 2)
Determine whether the expression represents a difference of two squares.x2 - 47
A. Yes B. No