exam Maths Puzzle Numerical Ability

Quartic Regression? Can you define this?

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exam Other Question

I am trying to show the result of adding two fractions.
x=times and /= divide

What are the steps to show that
u x i/2pi x (D+d)+ u x i/2pi x (D-d) is equalt to u x i x D/pi(D sq -d sq)

Hope you can help Problem: Find the number of permutations of the first 8 letters of the alphebet for each situation.

25. taking 5 letters at a time