One way to measure the water content of a soil is to weigh the soil both before and after drying it in an oven. The water content is 
, where 
is the mass before drying and 
is the mass after drying. Assume that = 1.32 ± 0.01 kg and = 1.04 ± 0.01 kg.
a. Estimate W, and find the uncertainty in the estimate.
b. Which would provide a greater reduction in the uncertainty in W: reducing the uncertainty in 
to 0.005 kg or reducing the uncertainty in 
to 0.005 kg?
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A) 25 B) 45 C) 65 D) 85
A contractor purchases 225 bags of cement and 38 bags of lime. The job requires 105 bags of cement and 29 bags of lime. How many bags of lime are unused?
What will be an ideal response?
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A. Double-deck trailers B. Liquid cargo tankers C. Lowboys D. Single-drop lowbeds