Dilate with a scale factor of 1/2 about the origin

Will used 20 colored tiles to make a design in art class. 5/20 of his tiles were red. what is an equivalent fraction for the red tiles?

The surface area of the triangular prism is .

Which of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319