20 is 85% of what number

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

The frequency table shows a set of data collected by a doctor for adult patients who were diagnosed with a strain of influenza. patients with influenza age range number of sick patients 25 to 29 30 to 34 35 to 39 40 to 45 which dot plot could represent the same data as the frequency table? patients with flu

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie