exam Maths Puzzle Numerical Ability

primefactorization of the number 20

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I need to come up on showing how to answer the square root of 74. It was from a question that started from 5 to the 2nd power + 7 to the second power which I believe is 74 so I nee Richard drove his rig at �x� mph for 3 hours, then increased his speed to (x + 15) mph and drove 2 more hours. Write a polynomial that represents the total distance that he traveled. How much distance he covered if x = 45 Mph?