book Maths Puzzle Numerical Ability

Multiply and simplify.

(2 sqaure root of 5)sqaured

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book Other Question

If you travel only 35 miles per hour, is 2.5 hours enough time to get to a concert that is 85 miles away? Give an expressionto find answer... find the domain and range of the function
f(x)= xsquared-x