A rectangular prism has a surface area of 400 cm 2. If it is 10 cm long and 10 cm wide, what is its height?

4 cm
5 cm
8 cm
40 cm

The line plot below represents the number of letters written to overseas pen pals by the students at the waverly middle school. each x represents 10 students. how many students wrote more than 6 and fewer than 20 letters. a.250 b.240 c.230 d.220