Suppose a triangle was scaled so that it is 12% smaller. It had an original area of 13 units squared. Find the new area. My teacher said it is 13 x .88^2=10.0672
but i'm not sure because all my life i've done it just 13 x .88=11.44.
Anybody?

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".

4a. is 3 miles every hour

4b. is 1/3 of an hour per mile

step-by-step explanation:

1,8,15,22,29,36,43,50

step-by-step explanation: