exam Maths Puzzle Numerical Ability

6-a/b over 24/b
this is a fraction - I came up with -a/4...not sure if this is right?

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exam Other Question

Mr.Thompson invests a principal of $8000; part at 8% per annum and the rest at 10% per annum. After one year, the total interest was $724. How much did Mr. Thompson invest at each rate? Find the what what and the what? please help me!!! Find (a)the directrix,
(b) the focus and (c) the roots of the parabola y = x^2 - 5x + 4
(a)_________________
(b)_________________
(c)_________________