Find the product.(11y2 + 6)(11y2 - 6)
A. 121y4 - 36
B. 121y4 + 132y2 - 36
C. 121y2 - 36
D. 121y4 - 132y2 - 36
Answer: A
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Find the unknown side of the right triangle. Use a calculator or square root table when necessary and round to the nearest thousandth.
A. 12.649 cm B. 80 cm C. 160 cm D. 8 cm
Determine whether the system is consistent. x1 + x2 + x3 = 7 x1 - x2 + 2x3 = 72x1 + 3x3 = 15
A. Yes B. No
Find the sum.-3 + 1 + 5 + 9 + 13 + ... + (4n - 7)
A. n(2n - 5) B. n(2n + 5) C. n(4n - 7) D. n(4n + 7)
A type of lightbulb is labeled as having an average lifetime of 4000 hours. It's reasonable to model the probability of failure of these bulbs by an exponential density function with mean ? = 4000. What is the median lifetime of these lightbulbs?
Give your answer rounded to two decimal places.