maths help! determining quadratic rules?

  • Thread starter Thread starter Alfie
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A

Alfie

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here is the question:

the rate of rainfall during a storm ' t ' hours after it began was 3 mm per hour when ' t ' = 5, 6 mm per hour when ' t ' = 9 and 5 mm per hour when ' t ' =13. Assuming that a quadratic model applies, find an expression for the rate, ' r ' mm per hour, in terms of ' t '.

PLEASE HELP!!

thanks soooo much
xxx
 
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