Answer: 
A plant is already 43 centimeters tall, and it will grow one centimeter every month.The height of the plant after 34 months will be 77 cm. 
Solution: 
Given that current height of the plant is 43 centimeter. 
Growth rate of plant is 1 cm in a month 
So increase in height in 1 month = 1 cm 
Similarly increase on height in 

So we can say that increase in height in “m” month = 
 = “m” cm
 = “m” cm 
After “m” months, 
Total height H(m) = current height + increase in height in m months 
H(m) = 43 + m 
So after m=34 months 
H(m)=43+34 
H(m)=77 cm 
Hence height of the plant after 34 months will be 77 cm.