Simplify the expression by using a sum or difference identity.cos 10° cos 35° - sin 10° sin 35°
A. 
B. 
C. 
D. 
Answer: D
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Find the volume of the solid generated by revolving the shaded region about the given axis.About the x-axis
A. 
?
B. 
?
C. 
?
D. 30?
Estimate the answer by rounding as indicated.Estimate by rounding to nearest thousand.
A. 256,000 B. 257,000 C. 258,000 D. 247,000
Use a double integral to find the volume of the solid shown in the figure.
?
?
__________ cu units.
Fill in the blank(s) with the appropriate word(s).
An oil-drilling company knows that it costs $95,000 to sink a test well. If oil is hit, the income for the drilling company will be $875,000. If only natural gas is hit, the income will be $340,648. If nothing is hit, there will be no income. If the probability of hitting oil is 
and if the probability of hitting gas is 
style="vertical-align: middle;" data-wiris-created="true" varid="variable_id_field" variablename="impvar_eb48c6e9d46642ba81a356a23" />, what is the expectation for the drilling company? Should the company sink the test well? Please round your answer to the nearest dollar. ? The expectation is __________, the company __________ (should, shouldn't) dig. What will be an ideal response?