Suppose that, for a certain exam, a teacher grades on a curve. It is known that the mean is 70 and the standard deviation is 8. There are 50 students in the class. What score would be necessary to obtain an A at least?
?
     
?
__________ or above

Fill in the blank(s) with the appropriate word(s).


86

Mathematics

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Shade the solution set in the xy-plane.x + y ? 6

A.



B.

C.

D.

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Multiply and simplify. Assume variables do not cause any denominators to equal 0.-  ? 

A. - 
B. - 
C. - 
D. - 

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Solve the problem.Find -x when x is 22

A. -22
B. 0
C. 22
D.

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Convert to scientific notation.0.0000000838011

A. 8.38011 × 108 B. 8.38011 × 10-7 C. 8.38011 × 10-9 D. 8.38011 × 10-8

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