Find the product.(4a + 5c)(4a - 5c)
A. 16a2 - 25c2
B. 16a2 - 40ac - 25c2
C. 4a2 - 5c2
D. 16a2 + 40ac - 25c2
Answer: A
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Solve the problem.The intensity of a certain noise is 1.28 × 10-8 W/cm2. How loud, in decibels, is this sound level? Use the formula 
where 
(Round to the nearest decibel.)
A. 82 decibels B. 81 decibels C. -21 decibels D. 34 decibels
Find the partial derivative.Find fy(5, -6) when f(x,y) = 7x2 - 9xy.
A. 39 B. -45 C. 129 D. -54
A cone sliced by a plane results in a type of curve called a conic section. Use the given information and figure to identify the conic section produced in the plane. The plane is parallel to the side of the cone. 
A. ellipse B. circle C. parabola D. hyperbola
Solve. Remember to insert units when writing your answer.A company wishes to ship 6 boxes of their product, each box weighing 6 lb 
What is the total weight of 
A. 37 lb 14 oz B. 12 lb 14 oz C. 36 lb 14 oz D. 36 lb 5 oz