Please help me answer questions #3-5

Find the area of a trapezoid with a height of 23, base 1 of 10 and base 2 of 18

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

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?