200 - (2x) = 42
200 - 42 = 2x
158/2 = 2x/2
x = 79
he is 79 years old
hope this helps
a wise 'old' man
You could try an Array or Area
-8
2(4) is 8, and because you are multiplying a negative by a positive, the result is negative.

To fine one gallon:



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Answer: 1 gallon can traveled 29 miles---------------------------------------------------------------