exam Maths Puzzle Numerical Ability

Please help me with this equation I having some troubling figureing out how to solve it. sqrt{{{(12x^3)/5}}}

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exam Other Question

Jim gets on a bike and travels to a location and back. The trip is 40 miles long. The return trip is 2 hours longer and his spead is decreased by 10 miles per hour. How hast did Jim go there and back? Can someone please help me I don't understand it....

Directions: Find all positive values for K for which each of the following can be factored.

Problem#1

x^2 + x - k

D