Express the product as a sum containing only sines or cosines.-2 sin(5?) sin ?
A. cos(6?) - cos(4?)
B. cos(6?) + cos(4?)
C. cos(7?) - cos(3?)
D. cos(7?) + cos(3?)
Answer: A
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Match the equation with the surface it defines. 
+ 
= 1 
A. Figure 4 B. Figure 2 C. Figure 3 D. Figure 1
Find the standard deviation. Round to one more place than the data.9, 20, 16, 16, 7, 15, 17, 18, 5, 16
A. 5.0 B. 4.7 C. 4.5 D. 1.5
Provide an appropriate response.The volume of water in the lake is seven billion, eight hundred twenty-one million, ninety-four thousand, six hundred thirteen gallons. Write this whole number in standard form.
A. 7,821,940,613 B. 782,194,613 C. 7,000,821,094,613 D. 7,821,094,613
Solve.The child-proof cap of a medicine bottle will not function properly if the radius r of the cap is more than 51.6 millimeters or less than 51.3 millimeters. Express this as an inequality.
A. r < 51.3 or r > 51.6 B. 51.3 ? r ? 51.6 C. r ? 51.3 or r ? 51.6 D. 51.3 < r < 51.6