Hello, I need help with the last 2 columns mainly (it’s the bottom chart by the way).

What is the area of triangle abc if a = 8, b = 11, and c = 15?

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 measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)