exam Maths Puzzle Numerical Ability

Find the slope of the line passing through the points (4,0) and (4,5). Is it undefined, m=0, m=1 or m=5? Please help, thanks.

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factor completely

z^4-81 i need help to understand these problems the steps they are odd problems therefore the answers are in the back but i do not understand how to get to them.

directions: sketch the