exam Maths Puzzle Numerical Ability

State the domain of the following
Question 1

a) f(x)=suareroot x+4

b) g(x)= 2x+1/x-3

c) h(x)= 3x^2+5x-3

d) l(x)= 2x+3

m(x)= 3/x^2+7

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exam Other Question
In triangle CDE, CD = 3y, DE = 30, and CE = 45. Determine the range of possible values for y. 0.6(x-50)=18-0.3(40-10x)