exam Maths Puzzle Numerical Ability

PLease help to factor

64a^3c^6 - 27x^9

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exam Other Question

Solve the following systems of linear inequalities by graphing.
3x-y<2
x+y>2



3x-y<2
y<-3x+2


x+y>2
y>2+x


I'm double checking to see if I am on the right track.
Points R, S, and T are collinear, with point S between points R and T. If RT = 30, and ST = 2x + 4, what is the possible range of values for x?