exam Maths Puzzle Numerical Ability

please someone check this for me?

3x/x-7-21/x-7
3x-21/x-7
3(x-7)/x-7
3x-21/x-7

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exam Other Question

I still need help on conversions. This question is off a worksheet
v2=76.98m/s
t=15.4s
a=-9.8m/s
v1=?
If (x-1)^4+(x-5)^4-8=0

what is the value of

x^3+6x+2