Select all the expressions that are equivalent to x2+4x. (^2 means raising something to the 2nd power.) Group of answer choices

x(x+4)

(x+2)^2

(x+x)(x+4)

(x+2)^2-4

(x+4)x

Can someone me and do the problem plz so i can understand it more better

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?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?