Explain how to do this for 20 points answer must be right and explain how you did it.

D

Step-by-step explanation:

A

Step-by-step explanation:

First we need to find the perimiter of a parallelogram

Side A is the slanted line,

Side B is the 2 horizontal lines.

The equation for this is 2(a+b)

Let's plug in the measurements:

2(18+27) =

2(45) =

90

So the parallelogram is 90 now we have the perimeter of the semi cirlce already which is 18

90 + 18 = 108

Hope this helps :)

the answer is 0.071

good luck! : d

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".