Mr. Washington made several purchases for his printing business. The mean price of the purchases was $150, and the mean absolute deviation was $30. Based on this information, which statement must be true?

a. One purchase was $150.

b. Two purchases were $30 apart in price.

c. All of the purchase prices were between $120 and $180.

d. The average difference in purchase price is $30 away from $150.

rectangular prism would best match the box of cards

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use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative