In? 2008, a country used ? twenty-five percent or 100 million tons of all the grain grown that year to produce ethanol. how much grain was grown in the country in? 2008?

400,000,000 tons

Step-by-step explanation:

You could reword this sentence to ask the question, "100,000,000 is 25% of how much?"

The word "is" means equals, the percent will be .25 in decimal form, the word "of" means to multiply, and "how much" is x, our unknown.  In equation form, then, this looks like

100,000,000 = .25 × x

We will divide both sides by .25 to get that

x = 400,000,000

That's how much grain was grown in 2008

(sample response)

Algebra tiles would not be a good tool to use to factor the trinomial because you would need to drag an x-squared tile, 18 x-tiles, and 80 plus tiles. That is a total of 99 tiles. It would take a lot of time to drag that many tiles on the board and there might not be enough space to hold all of them. You would also need to determine how to arrange all those tiles to make a rectangle. Since 80 is a multiple of 10, you might recognize that 10 and 8 are the factors that add to 18, which would give you the values to use in the X method.