book Maths Puzzle Numerical Ability

y=(1/2)x+1 the distance of the point (3,0)?

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book Other Question

I get this far and then stuck and not sure if its right.

Simply and write answer in positive exponents only

(x^2)^-3 (x^-2) divided by (x^2)^4

My answer
x^-1 times x^-
Ms jordan has been given a loan of $2500.00 for 1 year if the interest charged is $275.00 what is the interest rate on the loan?