exam Maths Puzzle Numerical Ability

Write the equation of the line passing through (3,-7),(-6,-7)

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exam Other Question

Find the length of each side of the rectangle so that it has the given perimeter.

2x - 5

x

Perimeter = 50 in.
Simplify the following fraction.
2x^2+x-6 /2x+4
I did it this way but I am not sure if it is right.
(2x+x)(x-6)/2(x+4)= 2x^2-6/2+4= 2x^2-6/6= 2x^2
Could someone please tell me if that is right?