exam Maths Puzzle Numerical Ability

Please help. Much apppreiated.
Express using a positive exponent
r^-2

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exam Other Question

If the sqaure of a positive integer is added to three times the integer, the result is 28. Find the integer.

Need help setting up the problem and possible solving. Once it is set up, I am good with solving it. PLEASE help~ A machine can fill 3864 cartons of milk in 0.4 hour. How many cartons of milk can it fill per hour?

I came up this 7728. Can you tell me if this is correct?