exam Maths Puzzle Numerical Ability

I need help with calculate the value of X.
Please, help me.
Z=-log2^4

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exam Other Question

Find the slope, if it exists, of the line containing the pair of points.

(1,10) and (8,-8)
The slope m=-18/7
There are 850 Douglas fir and ponderosa pine trees in a section of forest bought by Sawz Logging Co. The company paid an average of $300 for each Douglas $217,500 for the trees, how many of each kind did the company buy?