Solve the problem.What is the coefficient of x3y4 in the expansion of (x - 2y)7?

A. -35
B. -560
C. 35
D. 560


Answer: D

Mathematics

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P(E) is the probability of an event E occurring, and O(E) is the odds of an event E occurring. Solve the following problem.If O(E)=1:3, find P(E).

A.
B.
C.
D.

Mathematics

Solve.Two machines are turned on at 8:00 A.M. If one can produce 69 items each hour and the other can produce 70 items each hour, at what time will they produce a total of 278 items?

A. 9:00 A.M. B. 10:00 A.M. C. 11:00 A.M. D. 11:30 A.M.

Mathematics

Solve the variation problem.The amount of water used to take a shower is directly proportional to the amount of time that the shower is in use. A shower lasting 22 minutes requires 15.4 gallons of water. Find the amount of water used in a shower lasting 4 minutes.

A. 3.5 gallons B. 2.1 gallons C. 2.8 gallons D. 88 gallons

Mathematics

Evaluate the expression without the use of a calculator, and then verify your answer using a calculator.log 10,000

A. -4
B. 4
C. 40
D.

Mathematics