exam Maths Puzzle Numerical Ability

Explain permutations and combinations and the difference between the two. Use examples to illustrate.

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exam Other Question

help!!!!
if f(2x)=4/2+x

calculate
2f(x)=? I have tried to set this one up but have been unsuccessful. Can anyone help me out?

Find each value of x.

log4 x = 1/2

the 4 next to the log in like an exponent but shows below it. Thanks!