exam Maths Puzzle Numerical Ability

Find the slope of the line through the following pairs of points.
(-5,-3) and (-5,2)

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exam Other Question

A fish is 75 cm long.The head is as long as the tail.If the head were twice as long and the tail were its present length,the body would be 45 cm long.How long is each portion of the fish? The problem is:

3x^2+5=11

I started by subtracting 11 from both sides to turn the equation into:

3x^2+5-11=0

I believe I then have to factor but im not sure how? What would be the next step if the above is correct?