A code is formed using four of these letters: A, B, I, K, N, O, and T. (Note that the order of the letters in the code matters;
for example, ABIK is a different code from BAIK.) The size of the sample space is . The probability that the first three letters of the four-letter code are vowels is .
2 answers:
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ANSWER
The correct answer is
EXPLANATION
The mapping for reflection across the x-axis is given by
Given
. We can let 
we can write the ordered pair
or 
as the ordered pair of the preimage of 
.
The image function will have the ordered pair
or
.
That is, we negate all the y-coordinates.
Therefore
.
The correct answer is
EXPLANATION
The mapping for reflection across the x-axis is given by
Given
we can write the ordered pair
The image function will have the ordered pair
or
That is, we negate all the y-coordinates.
Therefore