exam Maths Puzzle Numerical Ability

I need an explanation to this:
Genaerate ordered pairs fo y= x-4 using x= 2,3,4,5 and 6. Graph the ordered pairs and describe the pattern.
After that it shows a graph
input output ordered pair

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Tutors your help is needed...Simplify sq rt symbol 48 + sqrt symbol 75

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9) Solve. Round results to the nearest thousandth.

7x2 - 6x - .4255 = 0