exam Maths Puzzle Numerical Ability

simplify the square root of 20 power 5 minus 1 power the square root of 5

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exam Other Question

how can u simplfy radicals when there are variables involved and there is a number on the outside of the square root? What is the value of f(-3) for the function f(x)=4.7x+1.6?

A. -18.3 B. -15.7 C. -12.5 D. 15.7