Which of the following statements are correct about the constant of proportionality? Select ALL that apply. A. The perimeter of a square is proportional to the length of its sides. This relationship can be expressed by the equation p=4s. The constant of proportionality is 4.
B. The circumference of a circle is proportional to its diameter. The relationship is given by the equation r = пd. The constant of proportionality is d.
C. The radius of a circle is proportional to its diameter. The relationship is given by the equation r = 1/2 d. The constant of proportionality is 1/2
D. The area of a triangle is proportional to its lengths. The relationship is given by the equation A = 1/2 bh. The constant of proportionality is h.

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".

answer: d. $20

step-by-step explanation:

just took the test

answer: 819.89 miles across america

step-by-step explanation:

i am not sure :

step-by-step explanation: