Answer: The required inequality is

Step-by-step explanation: Given that Svetlana's hair is 4 cm long and her hair grows 1.5 cm per month. Svetlana wants her hair to be less than 16 cm long.
We are to write an equality to determine the number of months, m, Svetlana can allow her hair to grow so that it is less than 16 cm long.
The total length of her hairs in months 'm' is given by

Since Svetlana can allow her hair to grow so that it is less than 16 cm long, so we must write

Thus, the required inequality is
