exam Maths Puzzle Numerical Ability

1. What is the property of a*(b*c)=(b*c)*a
2. What is the property of b(c+a)=b*c+b*a
3. What is the property of a*b+0=a*b

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exam Other Question

A car travels 240 miles on 15 gallons of gas. How far can the car travel on 20 gallons of gas? Show:

{P is an element of R[x]: p(8)=0} ? R[x]

(Where R is all reals)