Write an inequality to determine the number of months, mmm, it will take Svetlana's hair to grow so it is at least 777 centimeters long.

Question

Svetlana's hair is 444 centimeters long. Her hair grows 1.51.51, point, 5 centimeters per month. Svetlana wants her hair to grow so that it is at least 777 centimeters long.

Answer 1

We start at 44cm

To this we add 1.5 cm per month or 1.5m cm

We want the total to be AT LEAST 777 cm

 

444 + 1.5m ≥ 777

1.5m ≥ 777-444

1.5m ≥ 333

m ≥ 333/1.5

m ≥ 222 months or 18.5 years

 

In 222 months her hair will be 777 cm.

After that it will be longer.