It is estimated that it will take 217 labor hours to construct a block wall. Using a burdened hourly rate of $38.75 per labor hour, determine the labor cost to construct the wall.
What will be an ideal response?
Determine the labor cost as follows:
Labor cost = 217 hr × $38.75/hr = $8,409
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Describe some ways that nature is balanced
What will be an ideal response?
One way to reduce the amount of refrigerant spray when connecting and disconnecting refrigeration hoses from Schrader valves is to:
A) Use positive shutoff hoses. B) Loosen the end of the hose on the gauge manifold and slowly release the pressure. C) Pinch the hose closed behind the fitting with a pair of pliers before removing the hose. D) Make sure the system is operating before connecting or disconnecting from the high side.
Posttensioning of concrete slabs is used to _____
a. reduce the amount of reinforcing steel needed b. shorten the curing time of the concrete c. allow the use of lower-strength concrete d. reduce cracking under heavy load
A medical researcher wants to determine whether exercising can lower blood pressure. At a health fair, he measures the blood pressure of 100 individuals, and interviews them about their exercise habits. He divides the individuals into two categories: those whose typical level of exercise is low, and those whose level of exercise is high.
a. Is this a controlled experiment or an observational study? b. The subjects in the low exercise group had considerably higher blood pressure, on the average, than subjects in the high exercise group. The researcher concludes that exercise decreases blood pressure. Is this conclusion well-justified? Explain.