math

Shelly sews a blanket that has an area of 170 square feet. it has 30 square blocks, each the same size. What is the approximate length of each side of a block.
a. 1 foot
b. 2 feet
c. 3 feet
d. 4 feet

I doubled checked and the problem is correct. I just can't figure it out.

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asked by Larry

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