Please do this for me I’m having a very hard time and failing math because of this!

Simplify.7x + 3y - 2 + 6x + 1 + y squared 2 you! ; )

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?

Which expression is the factorization of x^2+10+21