Simplify. 12k - 6 + (3k)(4) is it -6, 6, 24k + 6, or 24k - 6?

its actually super easy, but i am kind of confused. : t

Julia measured the high temperature in her town for one week. using the chart above, find the mean absolute deviation for the high temperatures. round your answer to the nearest tenth. be sure to show your work for finding: the mean of the set of data the distance of each number from the mean the mean absolute deviation

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

What are the digits that repeat in the smallest sequence of repeating digits in the decimal equivalent of 24/11?