exam Maths Puzzle Numerical Ability

PLease help me simplify:

r^2/r-s + s^2/s-r

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exam Other Question

Simplify

(w^7)^-4 Hi Can I have some help with a linear function is given?
g(x) = -7x + 8

(a) Find the average rate of change of the function between x = a and x = a + h.

(b) Find the slope of the line