exam Maths Puzzle Numerical Ability

How do I solve: simplify the equation with rational exponents

25 1/2 + 27 1/3

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exam Other Question

What is the range of the function : -2(y-4)=5(^x+2) ? I think it is y such that y is greater than 4. Use a table of values to graph f(x) and g(x) on the same set of axes.

f(x) = 2^3x and g(x) = 8^-x