exam Maths Puzzle Numerical Ability

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?

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exam Other Question

If I was given the points ( -2, -4) (1,-1) would my answer be y=1x+2?
And if I was given the points (2,4) and (-3,-1) would my answer be y=1x-2?

Thank you for your help! A vending machine will accept nickels and dimes only. The attendant checks the machine and finds a total of 42 coins whose value is $3.40. How many coins of each type were there?