book Maths Puzzle Numerical Ability

Find the distance between (6, �1) and (5, 8).

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I dont understand ho to do this, please help me asap....
Complete the ordered pairs so that each is a given equation?
y=-2x+5 (0, ),( ,5),(3/2, ),( ,1)

I dont understand what Hannah Wants to hire a painter to paint her house. Painters plus charges $360 plus $12 per hour. Davis and Sons charges $279 plus $15 per hour. Write and solve an equation to detir