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SAT模拟考试题:SAT数学练习题(19)

2016-08-11 17:01:57来源:网络

  Answer: 1

  Explanation:

  f(x) - 1 = f(x2) - x2

  (x - 1) - 1 = (x - 1)2 - x2

  x - 2 = x2 - 2x + 1 - x2

  x - 2 = -2x + 1

  x = 1

  Question 5: The amount of time taken to build a house is inversely proportional to the number of construction workers on the job. If it takes 6 workers 6 days to complete such a job, how many days will it take if the job is done by only 4 workers?

  Answer: 9

  Explanation: The amount of time taken to build a house is inversely proportional to the number of construction workers on the job, so Nworkers = k/Ndays

  k = Nworkers·Ndays

  k = 6·6, as it takes 6 workers 6 days to build the house

  k = 36 worker·days

  k = 4 workers · Ndays_4workers

  Ndays_4workers = 36/4 = 9 days

  Question 6: If side a of triangle ABO is tangent to the circle of center O, what is the value of the radius of the circle in inches? Side a of the ABO triangle is 4 inches and side b of the same triangle is 5 inches.

SAT模拟考试题:SAT数学练习题

  Answer: 3

  Explanation: Side a is tangent to the circle, so the triangle created by the sides a, b and c is right.

  c2 = b2 - a2

  c2 = 52 - 42

  c2 = 9

  c = 3

  Question 7: A jar contains a nickel, a dime, and six quarters. Tom draws a nickel from the jar, and then Mary draws a dime from those remaining. If the probability that Tom draws the nickel and Mary draws the dime is 1/x, what is the value of x?

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本文关键字: SAT模拟考试 SAT数学

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