exam Maths Puzzle Numerical Ability

7^2-4(8-6)

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I need this asap!! I'm trying to pass this class!!!

graph log 2(2x)

graph y = log2(x)

graph y=e^x and z=e^(2x)in the same window

graph y=log2(x)and z=log2(2x)in the sam
Evaluate (-7z)2 and -7z2 when z=10 (Both 2's are the little 2's above the letter/parenthisis.)

Help me with this please.