Elena went to a store where you can scoop your own popcorn and buy as much as you want. She bought 10 ounces of spicy popcorn for $2.50 How many oz. of popcorn can you buy per dollar?

4 ounces

Step-by-step explanation:

She bought 10 ounces of spicy popcorn for $2.50

How many oz. of popcorn can you buy per dollar?

Let

oz. of popcorn can you buy per dollar = x

10 ounces : $2.50 = x ounces : $1

10 / 2.50 = x / 1

Cross product

10 * 1 = 2.50 * x

10 = 2.50x

Divide both sides by 2.50

x = 10 / 2.50

= 4

x = 4 ounces

You can buy 4 ounces of of popcorn for $1

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 believe the answer is the polygon, heptagon.