exam Maths Puzzle Numerical Ability

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

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40. The cost in millions of dollars for a company to manufacture x thousand automobiles is given by the function C(x) = 4x2-40x+225. Find the number of automobiles that must be produced to minimize cost. 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