Add or subtract, if possible. Assume that all variables represent non-negative values. Simplify your answer. 4 
+ 2xy 
A. 6xy5
B. 6x2y5
C. 10 xy4
D. 10x2y4
Answer: C
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Use the Trapezoidal Rule with n = 4 steps to estimate the integral.
A. 10
B. 
C. 40
D. 20
Solve the problem.In September 1998 the population of the country of West Goma in millions was modeled by 
At the same time the population of East Goma in millions was modeled by 
In both formulas x is the year, where 
corresponds to September 1998. Assuming these trends continue, estimate what the population will be when the populations are equal.
A. 18 million B. 16 million C. 17 million D. 1 million
Convert. When necessary, round the answer to two decimal places.5.5 gallons = quarts
A. 44 B. 10 C. 20 D. 22
Find the equation of the parabola corresponding to the given information.The parabola has focus ( 4 , 0 ) and directrix x = -4.
A. y = x2
B. x = y2
C. x = 
y2
D. x = - 
y2