Solve the problem. Over a period of 1 year, the price P of a certain commodity follows the model 
where P is in dollars per pound and t is in months. Assume that 
and 
(a) What is the price of the commodity in the 7th month? (b) What is the rate of change in the price of the commodity in the 7th month?
A. (a) About $5032.00;
(b) About $1.28/month
B. (a) About $56.89;
(b) About $11.31/month
C. (a) About $9.08;
(b) About $11.31/month
D. (a) About $8.96;
(b) About $1.28/month
Answer: B
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Find A ? B and A ? B for the sets A and B.A = {1, 
, 
, 
, 
, . . . }B = {
, 
, 
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A. A ? B = {1, 
, 
, 
, 
, . . . }
A ? B = {
, 
, 
}
B. A ? B = {1, 
, 
, 
, 
, . . . }
A ? B = {
, 
}
C. A ? B = {
, 
, 
}
A ? B = {1, 
, 
, 
, 
, . . . }
D. A ? B = {
, 
}
A ? B = {1, 
, 
, 
, 
, . . . }
Without using a calculator, give the exact trigonometric function value with rational denominator.sec 30°
A. 
B. 
C. 1
D. 
Find the foci of the ellipse.
+ 
= 1
A. (-2, -4), (4, -4) B. (-4, -4), (-4, 6) C. (-4, -3), (-4, 5) D. (-4, -2), (-4, 4)
Tell whether the expression is a monomial. If it is, name the variable(s) and coefficient, and give the degree of the monomial.12x-4
A. Monomial; variable x; coefficient 12; degree -4 B. Monomial; variable x; coefficient 12; degree 4 C. Monomial; variable x; coefficient 4; degree 12 D. Not a monomial