exam Maths Puzzle Numerical Ability

Help me please?

Find the domain and the range of the functions f(x), g(x) and h(x), if f(x)=7x-40, g(x)=70 and h(x)= -x^2 + 6x

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exam Other Question

how will you make 1.234 into fraction? The set of positive real numbers is closed under which operation(s)? Select all that apply.

a. Addition
b. Division
c. Multiplication
d. Subtraction