exam Maths Puzzle Numerical Ability

Can someone please help me with these. I thought I understood how to solve them but I am stuck and don't know what to do. Thank you.
a) sqrt of x - 1 = 3
b) sqrt of x^3 = 8
c)

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exam Other Question

Let M=B^a and N=B^c. Show why log(base b)MN = log(base b)M + log(base b)N. y=2^x++1?
y=x+6=?
y=log2(x-1)andy=x^3-4x find the graphs?
solve log2(x-1)=x^3-4x.
what does non linear mean?
what other methods do we have to solve these systems?