exam Maths Puzzle Numerical Ability

Factor:


9x^2 - 21x + 10

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exam Other Question

I certainly appreciate the help, less than and greater than i continue to get wrong. Please help me
Solve for x

13. -7 < 2x + 3 < 15

14. -5x +9 > -1
Same thing with this one can someone find the exact value of tan 15 degree without using tables or a calculator. please show work.