exam Maths Puzzle Numerical Ability

Can you please help me with this problem:
Sketch the graph of y=2^x-2 and y=log2(x+1)

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exam Other Question

The cost of purchasing incandescent bulbs for use over a 9750-hour peroid is $9.75. The energy cost for incandescent bulbs over this peroid is $73. The cost of one equivalent fluor Im stuck, please help it would be greatly appreciated.

Factor completely.

y^2 + 20y +96