Calculus
H′(90)=−15H^{\(\prime\)}\(\left\)(90\(\right\))=-\(\frac\)15
At t=90 dayst=90\(\text{ days}\), the plant is shrinking at a rate of 15 cm/day\(\frac\)15\(\text{ cm/day}\).
H′(90)=15H^{\(\prime\)}\(\left\)(90\(\right\))=\(\frac\)15
At t=90 dayst=90\(\text{ days}\), the plant is growing at a rate of 15 cm/day\(\frac\)15\(\text{ cm/day}\).
At t=90 dayst=90\(\text{ days}\), the plant is growing at a rate of 5 cm/day5\(\text{ cm/day}\).
At t=90 dayst=90\(\text{ days}\), the plant is shrinking at a rate of 5 cm/day5\(\text{ cm/day}\).