exam Maths Puzzle Numerical Ability

3a^2+15a
________
a^-25a

need help simplyfy

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please help how can I Write the equation of the line passing through each of the given pairs of points. how can I Write the result in slope-intercept form,
(-1, 3) and (4, -2)
John can paint the house in 4 hours. Mike can paint the same house in 6 hours. How long would it take both John and mike to paint the same house together.