11. Correct answer: (C)
x3 = y9
x in terms of y
Answer: (C) y3
12. Correct answer: (E)
The line segment with slope of -1
Topic(s): Coordinate geometry
A negative slope would mean the line is slanting from left to right.
13. Correct answer: (A)
The combination consists of 3 two-digit numbers
The combination satisfies
If each number satisfies exactly one of the conditions, which of the following could be the combination of the lock?
The combination to the lock
Test out the answers. Valid day of month should be between 1 and 31 (inclusive). Make sure that each of the number satisfies exactly one of the conditions.
This can be obtained by elimination.
(B)14-25-13 is incorrect because 25 is a multiple of 5 and it is odd
(C) 15-18-16 is incorrect because 15 is a multiple of 5 and it is odd
(D) 20-15-20 is incorrect because 15 is a multiple of 5 and it is odd
(E) 34-30-21 is incorrect because 21 is odd, 30 is a multiple of 5, but 34 is not a valid day.
Only (A) could be correct.
20 is a multiple of 4, 13 is odd and Kyle's birthday is on the 14
Answer: (A) 14-20-13
14. Correct answer: (C)
x > 3
An equation equivalent to
Square both sides
x + 9 = (x - 3)2 ⇒ x + 9 = x2 – 6x + 9 ⇒ x = x2 – 6x
Answer: (C) x = x2 – 6x
15. Correct answer: (E)
The number of integers from 1 to 100, inclusive that are not the square of an integer
Topic(s): Squares of integers
Square of integers from 1 to 100
12 = 1, 22 = 4, 32 = 9, …, 102 = 100
There are 10 integers from 1 to 100 that are squares.
So there are 100 – 10 = 90 integers that are not squares.
Answer: (E) 90
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