exam Maths Puzzle Numerical Ability

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Find the slope of the line passing through the points (4,0) & (4,5)


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exam Other Question
Dan paid a total of $41.55 last month for his international calls. He makes international calls only to England. Dan pays $0.06 per minute in addition to $15.75 fixed monthly payment. How many minutes of international calls did Dan make last month? Rewrite the following expression with positive exponents.


(32xy)^-3/7

This has me confused with the negative/positive exponents and the fraction exponent. Please help.