exam Maths Puzzle Numerical Ability

Could someone please assist me by solving this logarithmic equation step-by-step for future reference. Thank you.

log(7y + 1) = 2log(y+3)-log2

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exam Other Question

Can someone help me with this problem?

I need to find the mean of the following set of numbers:

13, 15, 18, 18, 18, 19, 22, 26, 28, 33

Thank you,
Sher
I have the following problem:

If 2f(x)+f(1-x)=x2(this should be "x-squared"), what is f(x)?

The answer is f(x)=1/3x2+2/3x-1/3. But how in the world do you get to this answer