Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Answer: D
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Provide an appropriate response.True or false? Consider the double integral
The first step in calculating this integral involves holding y constant.
A. False B. True
Solve the variation problem.The pressure of a gas varies jointly as the quantity of the gas (measured in moles) and the temperature and inversely as the volume of the gas. Suppose that the pressure of a particular gas is 
(kPa) when the quantity is 
the temperature is 
and the volume is 
Find the pressure of that gas when the number of moles is 9,
the temperature is 
and the volume is 
A. 1170 kiloPascals
B. 2160 kiloPascals
C. 1125 kiloPascals
D. 2250 kiloPascals
Solve the problem.If 3 balls are drawn at random from a bag containing 3 red and 4 blue balls, what is the expected number of red balls in the sample?
A. 1.29 B. 1.39 C. 1.54 D. 0.89
Translate the phrase to mathematical language and simplify.Subtract -2 from -12.
A. -12 + (-2); -14 B. -2 + (-12); -14 C. -12 - -2; -10 D. -2 - (-12); 10