Precalculus

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1. Write the given expression as a single logarithm.
log(70x)+log(10y)-2

2. Simplify the expression. (Do not use mixed numbers in your answer.)
(5x^7/8)(2y^4/6)(x^9/8)(4y^-2/6)

3. Write the given expression as a single logarithm.
-2Ln(x)+Ln(4y)-Ln(5z)

4. Simplify the expression. Assume that all letters represent positive real numbers. (Enter each exponent as an integer or a fraction.)
√ab ∛(ab^4)/√a(∛b)^4

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