exam Maths Puzzle Numerical Ability

Solve.
x^2+9<3x

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i would also like help with this please
Write an equation in slope-intercept form that satisfies each condition.
slope -1/2,passes through (2,-3)

i did it like
-3=-1/2(2)-b
but i dont think thats right please help Hi Can I have some help with this problem?

Write an equation that expresses the statement. Use k as the constant of variation.
S is directly proportional to the square root of r and is directly proportional to the square of t.