Which of the following sequences is NOT arithmetic? 6, 11, 16, 21, 26
-5, -3, -1, 1, 3
10,5, 0, -5, -10
7,4, 1,-1, -3, -6

The Torro Hailstorm Intensity Scale

If you would like to know what is the unit price for the hair shampoo, you can calculate this using the following steps:

500 ml ... $2.10
100 ml ...$x = ?

500 * x = 2.10 * 100    /500
x = 2.10 * 100 / 500
x = $0.42

The unit price for the hair shampoo is $0.42.