exam Maths Puzzle Numerical Ability

How can we best describe these terms:
x squared + 2x - 1

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exam Other Question

One number is six less than a first number. A third number is twice the first number. If the sum of the three numbers is 306, find the numbers. The volume of a can of soup is 144 PI inches cubed. The radius of the can is 6 inches. What is the height of the can?