Shayna ran 6 miles in one week this was 1/3 of what she ran in a month write and solve a division equation to find how far she ran in a month

For this case we must find the number of miles that Shayna ran in a month.

We know he ran 6 miles in a week.

So, let "x" be the number of miles that Shayna ran in a week:

Let "y" be the number of miles that Shayna ran in a month, so if what she ran in a week was of what she ran in a month we have:

So, Shayna ran 18 miles in a month

18 miles

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

the 3rd option is right

step-by-step explanation: