exam Maths Puzzle Numerical Ability

How do you completely factor out 8a^3+27b^3 or is it prime?

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exam Other Question

At 9 am a truck leaves the truck yard and travels west at a rate of 50 mph. Two hours later, a second truck leaves along the same route, travelling at 75 mph. When will the second truck catch up to the first?


~Thanks
which of the following are functions? explain your reasoning.

f(x)=10/x