exam Maths Puzzle Numerical Ability

Which of the following is the equation in slope-intercept form of the line that passes through (0, 2) and has a slope of -3.

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exam Other Question

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?
please help me to solve this: 1/81=27^(x-2)