When the numbers from 1 to 100 are written, in how many different numbers does the digit 3 appear?

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

Many newspapers carry a certain puzzle in which the reader must unscramble letters to form words. how many ways can the letters of emdangl be arranged? identify the correct unscrambling, then determine the probability of getting that result by randomly selecting one arrangement of the given letters.

Use the squared identities to simplify sin^2x cos^2x