Find the mean for the data items in the given frequency distribution. Round to the nearest hundredth, if necessary.
A. 6.19
B. 6.79
C. 5.37
D. 8.25
Answer: B
Mathematics
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Write an inequality involving the variable x that describes the set of numbers graphed.
A. x ? 7 B. x > 7 C. x ? 7 D. x < 7
Mathematics
Solve the system. If the system has infinitely many solutions, write the solution set with x arbitrary.8x + 4y = 716x + 8y = 5
A. 
B. {(0, 0)}
C. 
D. ?
Mathematics
Solve the problem.Suppose the sales of a particular brand of appliance satisfy the linear model 
, where y represents the number of sales in year x, with 
corresponding to 1995. Find the number of sales in 2011.
A. 12,200 sales B. 6000 sales C. 12,100 sales D. 6100 sales
Mathematics
Perform the indicated row operations on the following matrix. 
(-2)R1 + R2 ? R2
A. 
B. 
C. 
D. 
Mathematics