1plus 4 equals 5 + 2 + 5 equals 12 and 3 plus 6 equals 21 what does 8 plus 11 equal

Solve for x i'll try to attach the files bc it's not letting me for some reason

Naomi’s parents want to have 50,000, saved for her college education, if they invest 20000 today and earn 7% interest compound annually, about how long will it take them to save 50 thousand

Create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1.