Write an algebraic expression that is equivalent to y+x+y+y+x+x+x

Need on this geometry question. explain how you did it.

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?

The volume of a cube-shaped shipping container is 13,824 cubic inches. find the edge length of the shipping container.