Aa Help me plz :(

If 1/2 is half of 1, what is 1/2 of 2,3, and 4?

Svetlana's hair is 4 4 centimeters ( cm cm) long. her hair grows 1 . 5 cm 1.5cm per month. svetlana wants her hair to be less than 1 6 cm 16cm long. write an inequality to determine the number of months, m m, svetlana can allow her hair to grow so that it is less than 1 6 cm 16cm long.

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?