Which type of data would be best displayed in a histogram?

A:the number of dental chairs donated each for the last 12 (range 1-9)
B:the number of students seen in a school clinic that wore braces
C:the number of college students from the dental school that volunteered their time last month
D:the number of fluoride treatments given to students each month for the last 60 months (range 40-620)

Option D: the number of fluoride treatments given to students each month for the last 60 months (range 40-620)

Explanation:

The number of fluoride treatments given to students each month may be graphed with the 60 months on the horizontal axis, using a bar for each month.

The height of each bar will represent the number of fluoride treatments for the month and will be read on the vertical axis.

This histogram will permit to compare visually, in a very easy way, how the number of treatments vary month to month. That is why this is an ideal representation for this kind of data. In other form, it would be harder to compare a set of data for so many months and  whose range is so broad (40 - 620).

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".