exam Maths Puzzle Numerical Ability

Write in simplest form.

4r^2 - 25s^2

divided by

2r^2 + 3rs - 20s^2

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exam Other Question

Find the domain of each function.

f(x)=1/3x
I need help with this I am very lost here! Thank so much for your help.
find the slope intercept equation of the line that has the given characteristics
slope 4.3 and y interecpt (0,-4)
the slope intercept equation y=?