1+4=5 (4 x1 =4 add 1 =5)
2+5=12 ( 5x2 = 10 +2 =12)
3+6 = 21 (6x3 =18 +3 =21)
8+11 = ( 8x11= 96 +8 =96)
what's wrong with this answer

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

What will the graph look like for a system of equations that has no solution? a. the lines will be perpendicular. b. the lines will cross at one point. c. both equations will form the same line. d. the lines will be parallel.

Factor the expression using gcf 9b+45