A) The first day
B) The second day
C) The third day
D) The fourth day
E) The fifth day
\[ 21 - 2n, 21, 21 + 2n \]
In the above list, what is the average of the 3 numbers?
A) \( 21 - 2n \)
B) \( 21 \)
C) \( 21 + 2n \)
D) \( 63 \)
E) \( 2n \)
\[ 12 - 3n, 12 - 2n, 20, 20+n \]
In the above list, what is the average of the 4 numbers?
A) \( 12 - n \)
B) \( 12 + 2n \)
C) \( 16 - n \)
D) \( 16 + n \)
The sets of numbers \( X \) and \(Y \) satisfy the following property:
Every number that is in \(X\) is also in \(Y\).
Which of the following statements CANNOT be true?
A) 1 is in both \(X\) and \(Y\).
B) 2 is neither in \(X\) nor in \(Y\).
C) If 3 is in \(Y\), then 3 is not in \(X\).
D) 4 is in \(Y\) but not in \(X\).
E) 5 is in \(X\) but not \(Y\).
\[ 4, 5, 7, 11, 19 \]
Consider the list of numbers above starting with 4. Which of the following is a relationship for finding the subsequent number?
A) Add 1 to the preceding number.
B) Subtract 3 from the preceding number.
C) Halve the preceding number and add 3.
D) Double the preceding number and subtract 3.
E) Triple the preceding number and subtract 7.