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# Functions and sets

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1. For part (a) the answer includes x>=0. Why?

I get b

For (c) how do you work this out?
2. (Original post by Feynboy)
For part (a) the answer includes x>=0. Why?

Presuming you mean t >= 0, then: well, does negative time make sense to you?
3. (Original post by Feynboy)

For part (a) the answer includes x>=0. Why?

I get b

For (c) how do you work this out?
For c just work out how much the car travels between 6 and 10 seconds, then divide it by the time taken to cover it. That will be the average.

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Updated: September 13, 2016
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