exam Maths Puzzle Numerical Ability

9x^2-16y^2 over xy over 3 over y -4 over x

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exam Other Question

As light penetrates a body of water , its intensity 'I' decreases exponentially. For one particular pond it is known that the light intensity at the surface is 20candela/cm^2 and a Need help, got a test on Tuesday could you please show me how to work this problem.

y=mx+b;find m when x=-2, y=1, and b=5

I really appreciate any help you could give me