Which of the sets of ordered pairs represents a function? A = {(1, -2), (3, -5), (5, 2), (7,5)} B = {(4, 2), (4, -2), (9,3), (9,
2 answers:
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ANSWER
A. 1/9
EXPLANATION
When we have an expression with a negative exponent we can solve it by "flipping" the fraction and solving with the positive exponent:
In this problem we have to find:
We can think of a whole number as a fraction whose denominator is 1:
So we can use the trick:
And solve: