exam Maths Puzzle Numerical Ability

P(E)=0.30, P(F)=0.40,P(EnF)=0.1
P(EuF)=

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exam Other Question

3-3/4x=4 Solve the following equation for x:

x^2 + 5 = 21

Express your answer(s) in both "simplified radical" form, and in decimal form.

I came up with x=4 and x=sqrt16. Would this be correct.