Translate the sentence to an equation then solve.The product of 7 and a number x equals 42.
A. 7x = 42, x = 7
B. 7x = 42, x = 6
C. 42x = 7, x = 6
D. 
= 42, x = 1764
Answer: B
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Identify the type of surface represented by the given equation.
+ 
= 4
A. Ellipsoid B. Elliptical cylinder C. Parabolic cylinder D. Paraboloid
Using Green's Theorem, compute the counterclockwise circulation of F around the closed curve C.F = (x2 + y2)i + (x - y)j; C is the rectangle with vertices at (0, 0), (2, 0), (2, 3), and 
A. 24 B. -12 C. 12 D. 0
Solve the problem.The linear function f computes the distance y in miles between a car and the city of Vancouver after x hours, where 
The graphs of f and the horizontal lines 
and 
are shown in the figure. (i) When is the car 90 to 180 miles from Vancouver? (ii) when is the car's distance from Vancouver less than 180 miles. 
A. between 3 and 8 hours after departure; after it has traveled 1 hour B. before it has traveled 7 hours; between 7 and 8 hours after departure C. after it has traveled 1 hour; before it has traveled 7 hours D. between 1 and 7 hours after departure; before it has traveled 7 hours
Use the product rule to simplify the expression. Assume that the variables can be any real number.
A. ±x + 3
B. 
+ 3
C. x + 3
D. 