exam Maths Puzzle Numerical Ability

Find the domain of f(x)=7+sqrt3x+21 and express it using interval notation.

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exam Other Question

Please help me solve this problem. f(x) 2x^3-24x+5:
a) The interval(s) on which function increasing?
b) The interval(s) on which function decreasing?
c) Find the local minima, I have a 2 colomn 'proving lines parallel' proof. The equation goes like this;
given: angle 2 and angle 1 are congruent, angle 1 and angle 3 are congruent.
prove: line AC is par