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What expression is equivalent to 1/2(2+3x-6)

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

80 points suppose marcy made 45 posts online. if 23 of them contained an image, what percent of her posts had images? round your answer to the nearest whole percent. 54 percent 51 percent 49 percent 48 percent