book Maths Puzzle Numerical Ability

log1(x+1)=log4(x-3)

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book Other Question

i dont get how to do experimental and theoretical probablities.please explain these to me with a few examples. The sum of two numbers is 1457. Four times the first number minus twice the second number is 8. Find the larger number.

I had to turn my book in so I no longer can find the answer. I am in 8th grade Pre-Algebra