3x + 5y = 78 2x - y = 0

The point of intersection of the lines has an x-coordinate of

A. 78

B. 6

C. -6​

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with