Find an equation for the sphere with the given center and radius.Center (0, 0, 5), radius = 8
A. x2 + y2 + z2 - 10z = 39
B. x2 + y2 + 8 z2 + 10z = 39
C. x2 + y2 + z2 + 10z = 39
D. x2 + y2 + 8 z2 - 10z = 39
Answer: A
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Use a graphing utility to find the equation of the line of best fit. Round to two decimal places, if necessary.
A. y = 1.79x - 1.86 B. y = 0.43x + 1.79 C. y = 1.79x + 0.43 D. y = -1.86x + 1.79
Find the value of the expression without using a calculator.log5
A. 1 B. -1 C. 5 D. 0
Write the expression in condensed form.logb 7x + 3(logb x - logb y)
A. 
B. logb 
C. logb (7x + x3 - y3)
D. logb 
Solve the problem.The revenue achieved by selling x graphing calculators is figured to be 
The cost of each calculator is 
How many graphing calculators must be sold to make a profit (revenue - cost) of at least $695.80?
A. {x?49 < x < 71} B. {x?51 < x < 69} C. {x?50 < x < 48} D. {x?19 < x < 41}