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Maths Puzzle
Numerical Ability
Five tables and eight chairs cost $115; three tables and five chairs cost $70. Determine the cost of each table and each chair.
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I am trying to review for a final and would like to get help with A &B:
a. y= (10^x-10^-x)/ (2)
b. y= (e^x +e^-x) / (2)
one eighth times x equals 120 what is x?