What is the range for this set of data?
7 15, 12
03
KO 5
8
012

I'm not sure what KO means, so I'll diregard that for now.

How do we figure out the range of a data set?

The rules state we must find the difference between the smallest and largest numbers in the data set.

Let's organize the numbers, least to greatest.

Because we organized this from least to greatest, all we need to do is subtract the first number from the last number:

That means...

The range of the data set is 12!

Please let me know if this helped you, or if you have any questions!

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".

2nd one in the first row is correct