Help me please I need to pass summer school

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

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.

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?