exam Maths Puzzle Numerical Ability

Is 5+(1+9)=5+(9+1)commutative?

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exam Other Question

Graph the solution set of each inequality and write it in interval notation
{x|-3 ≥ x ≥ -7} A car rental compan has two rental rates. rate 1 is $72 per day plus $0.16 per mile. Rate 2 is $144 per day plus $0.08 per mile. If you plan to rent for one week, how many miles would you need to drive to pay less by taking rate 2?