3 years ago

Please show working out as well

Mathematics

1 answer:

romanna [79]3 years ago

7 0

Lets say David is x.

Now Stan is 4 years less than 2x. (2x-4)

John is x+3.

Therefore:

x+2x-4+x+3=35

4x=36

x=9

2x-4=2*9-4=18-4=14

x+3=9+3=12

David is 9, Stan is 14, John is 12.

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Given equation is $1.8^{-x+7} = 5$

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$1.8^{-x+7} = 5$

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