book Maths Puzzle Numerical Ability

I am having dificulty solving logirithms once I put them in exponential form and vice versa. Here is the question I am confused on LOGx 16=4/3

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book Other Question

Distributive, Associative, Commutative, or Identity?

1) 7k + (-3k)

2) 5x + (3x + 7)

3) 11(12p)

4) -9y + 2y + 7

5) 2m - 3m - 8n + n

6) 2x + (x + y)
What is the sum of all consecutive odd integers between 1 and 5000?