Michael is 3 times as old as Brandon. 18 years ago, Michael was 9 times as old as Brandon.
1 answer:
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f(x)=x²-1
g(x)=2x-3
f(x)*g(x)=(x²-1)*(2x-3)-----------> <span>this function exists for all real numbers</span>
the answer is the interval (-∞,∞)
using a graph tool see the attached figure
