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16 December, 15:38

Dr Adams is a botanist. she measures the daily height of a particular of sunflower is 60 days old. at 60 days, the height of the sunflower is 205 centimeters. Dr Adams finds that the growth rate of this sunflower is 2 centimeters per day after the first 60 days. how many day does it take for the sunflower to reach 235 centimeter

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  1. 16 December, 16:41
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    Lets write a linear equation to represent this flower growth, lets call y the height of the flower in centimeters and x the number of days passed:

    y = 205 + 2x

    that means that the flower height y, will grow 2 centimeterrs each x days.

    So if we have 235 cm height, we can find the amount of days needed if we replace in the equation and solve for x:

    y = 205 + 2x

    235 = 205 + 2x

    2x = 235 - 205

    2x = 30

    x = 15

    therefore the flower needs 15 days to reach 235 cm height
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