exam Maths Puzzle Numerical Ability

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?

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exam Other Question

The question is: Find the greatest or least value of the following functions.
1) x2-3x+5 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?