exam Maths Puzzle Numerical Ability

Find the domain of f(x)=7+ sqrt 3x+21 and express it using interval notation. How do I solve this?

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exam Other Question

The largest angle in a triangle is twice the degree measure of the second largest angle. One-third of the largest angle is 10 degrees larger than the difference of the other two. What is the measure in degrees of the smallest angle? write as an algebraic expression.:
the number of days in x weeks