10 mrs. smith has bolts of material that have lengths of 42, 63, and 105 inches. she needs to cut the fabric into equal length pieces with none left over. what is the greatest length of fabric pieces she can cut?

a.) 3 inches
b.) 7 inches
c.) 21 inches
d.) 42 inches

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".

nothjing

step-by-step explanation: