Which equation matches the given calculator-generated graph and description? Decide without using your calculator.
Parabola; opens downward
A. y = x2
B. y = -x2
C. x = -y2
D. x = y2
Answer: B
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Solve the problem.In a certain medium, sound travels at a speed of 7895 feet per second. How many meters per second does sound travel in this medium? Round to the nearest tenth.
A. 25,895.6 m/s B. 3079.1 m/s C. 2368.5 m/s D. 7184.5 m/s
Factor, if possible.343x3 - 1000y2
A. (7x - 10y)(49x2 + 70xy + 100y) B. (7x - 10y)3 C. Prime polynomial D. (7x - 10y)(49x2 + 100y)
Integrate the function f over the given region.f(x, y) = xy over the triangular region with vertices (0, 0), (3, 0), and (0, 10)
A. 
B. 
C. 
D. 
The scores on an economics examination are normally distributed with a mean of 62 and a standard deviation of 18. If the instructor assigns a grade of A to 10% of the class, what is the lowest score a student may have and still get an A? ? Round your answer to the nearest integer. ? __________ %
Fill in the blank(s) with the appropriate word(s).