exam Maths Puzzle Numerical Ability

I am having difficulty in solving the following exercise. I appreciate any help you can give me.

The only part of the height equation that we have not discussed is the constant

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Please help me with this question:
I am supposed to condense the logaithmic expresssion then write as a single log with a coeffecient as 1 and evaluate if possible.

^1/6(^log2x
Could someone help out with this one? #80. Work. Henry sold 120 magazine suubscriptions in x+2 days. If he sold at the same rate for another week, then how many magazines did he sell in the extra week?
Thank you.