I need help on this subject, if you could explain i'll be very happy.

1) Graph g(x) = - √x for x > 0

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State the domain and range of

2) where h(t) is the heigh above the ground in metres at time t seconds after it is thrown.

determine the domain and range of h(t).

3) for and

determine the domain and range of f(x)

4) consider

determine the domain and range of

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I really need help with this questions. If you could explain this to me i'll be very happy. Thank you for your helps.