exam Maths Puzzle Numerical Ability

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?

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exam Other Question

Sovle each inequality by making a sign graph of the factors. State the solution set in iterval notation and graph it?

5x-x^2<4

Can you please help me sovle this problem? 6-a/b over 24/b
this is a fraction - I came up with -a/4...not sure if this is right?