exam Maths Puzzle Numerical Ability

I need help solving these questions please
4+square root 7 divided by 2
exponent4 suare root 27

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exam Other Question

How do i write the expression as single quotient in which only positive exponents and or radical appear?

(x^2+4)^.5(2x)-(x^2)(.5)(x^2+4)^-.5(2x)/(x^2+4) 21: Refer to triangle DEF in Figure 5, if m Ang D = 30o, m Ang E = 60o, and DF = 12, what is ME in simplest form?