How can you show that two figures are either congruent or similar to one another?

What aspects of lines have to be diffrent

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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?