Perform the indicated row operations on the following matrix. 
(-2)R1 + R2 ? R2
A. 
B. 
C. 
D. 
Answer: D
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Solve the equation for y.16x + 9y = 14
A. y = 
x - 
B. y = 
x + 
C. y = - 
x + 
D. y = 16x - 14
Solve.Suppose that the sales of a particular brand of appliance satisfy the relationship 
where S(x) represents the number of sales in year x, with x = 0 corresponding to 1990. For what years will sales be between 1960 and 2320?
A. Between 1993 and 1996 B. Between 1992 and 1995 C. Between 4 and 7 D. Between 1993 and 1995
For the compound inequality, decide whether intersection or union should be used. Then give the solution set in both interval and graph forms.x ? -5 and x < -2
A. Union; (-?, ?)
B. Union; (-?, -2)
C. Intersection; [-5, -2)
D. Intersection; (-?, -5]
Evaluate the function for the given values of a and b. Then use the intermediate value theorem to determine which of the statements below is true.a = -2 and b = -1f(x) = 6x4 + 2x3 - 2x - 7
A. f(-2 ) and f(-1) have opposite signs, therefore f does not have a real zero between -2 and -1. B. f(-2 ) and f(-1) have opposite signs, therefore f has a real zero between -2 and -1. C. f(-2 ) and f(-1) have the same sign, therefore the intermediate value theorem cannot be used to determine whether f has a real zero between -2 and -1. D. f(-2 ) and f(-1) have the same sign, therefore f does not have a real zero between -2 and -1.