Line a has a sloped -2/3 and passes through (-4,-1). line b passes through (-4,5) and (-1,3). are these lines parallel, perpendicular, or neither?

Line cd passes through points c(1, 3) and d(4, –3). if the equation of the line is written in slope-intercept form, y = mx + b, what is the value of b? –5 –2 1 5

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?

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?