the height if a water thrown from the top of a building can be modelled by the relation h= -5t^+15t +20, where h is the height in metres and t is the time after the baloon was thrown in seconds. a) factor the expression fr the height of the water baloon b) what i the height of the ballon after 4 seconds ?? ) explain

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someone plase help me :(

b) t represents time, time is 4 seconds

yes

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