Book Maths Puzzle Co-ordinate geometry

The vertics of a right angle triangled are A(1,0),b(7,0)and c (1,8).write down yhe coordinates of the mid-point of all the three sides of the triangle.

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Book Other Question

how would u solve a the quadratic equation 3m(m+5)=0 by factoring? Could you please answer this question. I am stumped.
xy=x+y with y>2 solve for x

Thank you
Marc