Jack is 2 times as old as Lacy. 5 years ago the sum of their ages was 20. How old are they now?
1 answer:
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Answer:
Let f be a function. If any horizontal line intersects the graph of f more than once, then f does not have an inverse. An absolute value function (without domain restriction) has an inverse that is NOT a function. That's why an absolute value function does not have an inverse function。
