The ratio of pencils to erasers is 4:1 if there are 20 pencils how many erasers are there?​

Iwill give brainliest. suppose tommy walks from his home at (0, 0) to the mall at (0, 5), and then walks to a movie theater at (6, 5). after leaving the theater tommy walks to the store at (6, 0) before returning home. if each grid square represents one block, how many blocks does he walk?

Which rule describes the composition of transformations that maps △abc to △a”b”c

Is the number 128.439 a rational number