Find any relative extrema.f(x, y) = x3 + y3 - 9xy
A. No relative extrema
B. f(1, 1) = -7, relative minimum
C. f(3, 3) = -27, relative minimum
D. f(2, 2) = -20, relative minimum
Answer: C
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A company installs 5,000 light bulbs. The lifetimes of the lightbulbs are approximately normally distributed with a mean of 500 hours and a standard deviation of 100 hours. Find the approximate number of bulbs that can be expected to last the indicated amount of time.Less than 200 hours
A. 7 B. 4,444 C. 5 D. 10
Find the product.(12y + x)(12y - x)
A. 144y2 - 24xy - x2 B. 144y2 - x2 C. 24y2 - x2 D. 144y2 + 24xy - x2
Solve the problem.A rectangle has a length of x + 3 and a width of x - 3, and has an area of 40 square units. Find the length and width of the rectangle. (A = LW)
A. width = 2 units; length = 20 units B. width = 5 units; length = 8 units C. width = 1 unit; length = 40 units D. width = 4 units; length = 10 units
Solve the equation.7x - (3x + 8) = 8
A. 6 B. 3 C. 5 D. 4