PP- T1-PS139

[小花]

粗體字是答案


139. 14108-!-item-!-187;#058&009811
A set of 15 different integers has a median of 25 and a range of 25. What is the greatest possible integer that could be in this set?

(A) 32
(B) 37
(C) 40
(D) 43(E) 50

142. 14580-!-item-!-187;#058&010013
The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged?

(A) 100% decrease
(B) 50% decrease
(C) 40% decrease
(D) 40% increase
(E) 50% increase

143. 14954-!-item-!-187;#058&010212
In a survey of students, each student selected from a list of 12 songs the 2 songs that the student liked best. If each song was selected 4 times, how many students were surveyed?

(A) 96
(B) 48
(C) 32
(D) 24(E) 18

[dibert8]

139.
數線上 25 的左邊和右邊各有 7 個不同的數.
最小的數 = 25 - 7 = 18
18 + 25 = 43

[dibert8]

142.
R = k * [A]^2 / [B]
R = 反應速率, k = 常數, [A] = A 濃度, [B] = B 濃度
R = k * A^2 / B = k * X^2 / 2B => X^2 = 2 * A^2 => X = 根號2 * A
[(根號2 * A) / A ] - 1 = 0.4

[dibert8]

143.
12 首歌,重複選 4 次,每次選 2 首.
12 * 4 / 2 = 24

[小花]

謝謝dibert8大