Solve the problem.Bob owns a watch repair shop. He has found that the cost of operating his shop is given by 
, where c is cost and x is the number of watches repaired. How many watches must he repair to have the lowest cost?
A. 71 watches
B. 33 watches
C. 35 watches
D. 40 watches
Answer: B
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Identify the type of sampling described by the proposal.An education researcher randomly selects 60 of the nation's junior colleges and interviews all of the professors at each school.
A. convenience sample B. systematic sample C. simple random sample D. cluster sample sample E. stratified sample
Provide an appropriate response.If there any way you can think of to check whether or not your simplified expression is equivalent to the original radical expression?
What will be an ideal response?
Solve the problem.The cost for labor associated with fixing a washing machine is computed as follows: There is a fixed charge of $35 for the repairman to come to the house, to which a charge of $20 per hour is added. Find an equation that can be used to determine the labor cost, C(x), of a repair that takes x hours.
A. C(x) = 35 + 20x B. C(x) = ( 35 + 20) x C. C(x) = 20 + 35x D. C(x) = 35 - 20x
Express the set in simplest interval form.(-?, 8] ? [-4, ?)
A. [-4, 8) B. (-?, ?) C. [-4, 8] D. (-?, -4]