Please help me idk this

68 cm^2

Step-by-step explanation:

Step 1:find the area of triangle

Area of triangle=b*h*1/2

Area of triangle =8*2.5*1/2

Area of triangle =10 cm^2,there is also another triangle so the area of the other triangle is 10 cm^2 as well

Step 2:find the area of rectangle

Area of rectangle=l*w

Area of triangle=8*6

Area of triangle=48 cm^2

Step 3:Add all remaining numbers

10+10+48=68 cm^2

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".

i think it is c, not positive though

step-by-step explanation: