A. when are students first expected to work with picture and bar graphs? give the grade level, the domain and summarize the standard that expresses this expectation.

b. at the next grade level, students are expected to expand their understanding of bar graph to a scaled bar graph. give the grade level, the domain and summarize the standard that expresses this expectation.

c. sketch examples of a "single-unit scale bar graph" and a "scaled bar graph" using the techniques from this section to illustrate the standards in parts a. and b. explain your thinking.

this is for mth212 i am just confused with these problems.