What dos this mean??! I need to do it for a math at school

1.75 inches

Step-by-step explanation:

Looking at that very tiny ruler, between 1 and 2, there are 4 sections divided by the longest sticks. The (eraser?) is on the third line. So, it reaches three of the four available spaces:

You can think of this like money:

Each space between the lines can be represented by 1 quarter, and 4 spaces make up one inch (or $). The eraser reaches 3 spaces, or 3 quarters. 3 quarters is equal to 75 cents. Therefore, the eraser is 1.75 inches long.

:Done