The demand (in thousands) for a certain smart phone app as a function of the price p (in dollars) is given by x=35(8-0.4

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answerhappygod
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The demand (in thousands) for a certain smart phone app as a function of the price p (in dollars) is given by x=35(8-0.4

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The demand (in thousands) for a certain smart phone app as a function of the price p (in dollars) is given by
x=35(8-0.45p^2)^1/2 (0≤p≤4)
Find the demand when the price is $2.50.
Find the rate of change of demand with respect to price when the price is $2.50.
What does (0≤p≤4) mean within the context of this problem?
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