The perimeter of a rectangular piece of metal is 24 cm. it is 4 1/2cm wide. how long is it?

The length of rectangular piece of metal is 7.5 cm

Solution:

Given that perimeter of a rectangular piece of metal is 24 cm

To find: length of rectangular piece of metal

From given question,

The formula for perimeter of rectangle is given as:

perimeter = 2(length + width )

Substituting the given values we get,

Thus length of rectangular piece of metal is 7.5 cm

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".