exam Maths Puzzle Numerical Ability

Simplify by combining like terms.

the number x and the square root of 18, subtract 3 and the square root of 8x^2.

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exam Other Question

How do obtain the answer to this problem? Let X represent the number and then write the expression for the product.
The square of 5 more then a number. a person on a bike leaves an hour before a person on a motorcycle. the person on the bike is travelling at 10 mph. the person on the motorcycle is travelling at 40 mph. how long before the person on the motorcycle overtakes the person on the bike?