book Maths Puzzle Numerical Ability

I need help solving lenier problem 1/2x-3/4y=6

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I need the formula for computing the area of a circle have three problems that i am really stuck on and I don't even know where to begin

I HAVE 3 PROBLEMS THAT I AM CLUELESS ON HOW TO ANSWER. HERE THEY ARE

1) IF f(X)=3/8X SQU