Question

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

Answer 1

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