correct answer is (C).
7. B The lowest number that both 8 and 10 are factors of is 40. Convert the fractions to a
denominator of 40: = . There is no factor that 9 and 40 have in common, so the
fraction cannot be reduced. The number in place of a in is 9, so the answer is (B). Be careful
not to choose (D), which contains the value of b.
Fundamentals Drill 2: Calculator-Permitted Section
1. C Translate the words into math: 7 × n = 84, and we want to know the value of 4n. 7n = 84, so n =
12, and 4n = 48, (C).
4. D First, solve for x. Divide both sides of the equation by 3, and you get x = 4. Then divide 24 by
4, which gives you 6, which is (D).
6. D A “strong positive association” means that as one variable increases, the other one increases.
This will be shown as a line that angles through the graph from the lower left to the upper right.
These scatterplots don’t have any lines of best fit drawn on them, so imagine the line that would
go through most of the points on each graph. In (A), the points are all over the place, so no line
of best fit can even be drawn. Eliminate (A). In (B), the line that hits most of the points would
go from the upper left to the lower right. This is a negative association, not a positive one, so
eliminate (B). In (C), the line would go straight across, parallel to the x-axis. This is not a
positive association, so eliminate (C). The correct answer is (D).
9. D To solve this equation, get by itself. = 16, so square both sides: ( )^2 = 16^2 , so x =
- Choice (D) is correct.
14. D To figure out how much you need to add to 2.74 to get to 4.22, take 4.22 – 2.74 on your
calculator. The difference between the two numbers is 1.48. This increase reflects the same
number, t, added to each of the four numbers on the list. Divide 1.48 by 4 to find that t = 0.37,
which is (D).
20. B First simplify the equation 4x • n^2 = 4x+1 • n to 4x • n = 4x+1, and then try an easy number for x.
If x = 2, then 4^2 • n = 42+1. Since 16n = 4^3 , then 16n = 64 and n = 4. The correct answer is (B).
