Find the difference between 8/15 and- -2/3. Show all calculations in your final answer. I WILL GIVE BRAINLIEST TO THE CORRECT ANSWER!!!

When drawing a trend line for a series of data on a scatter plot, which of the following is true? a. there should be an equal number of data points on either side of the trend line. b. all the data points should lie on one side of the trend line. c. the trend line should not intersect any data point on the plot. d. the trend line must connect each data point on the plot.

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?