exam Maths Puzzle Numerical Ability

When f(x)=2x+3, g(x)=3-5x
How do I find the domain of f, g, f+g,f-g, fg, and ff.

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exam Other Question

this is a triangle. Given: side AB is congruent to CB, segment FD bisects side AB, and segement FE bisects CB. Prove:segment AD is congruent to segment CD. how could you use a calculator with only +, -, x, and division keys to check these claims about values of expressions involving fractional exponents?

a- 225 1/2 =15

b- 7 1/2