exam Maths Puzzle Numerical Ability

can you please help me: (((Graph the function y=f(x)=x^2)))

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exam Other Question

Round to the indicated decimal place.

7.76338 four decimal places

A) 7.763 B) 7.764 C) 77.6340 D) 7.7634

Help me with this one please? Would the answer be D??
factor completely: 2x^2-12x+18

factor completely: 2x^2-9

factor completely: 2x^3+6x^2-x-3