Which absolute value number sentence is false? a. 17 + +61 - 13
b. F-15 - +-81-7
c. |12| + -21 - 10
d. 1111 - 14 - 7

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

Cd is the perpendicular bisector of both xy and st, and cy=20. find xy.

The students in a class were asked how many siblings they have. the data obtained is represented in the dot plot. the number of students who have no siblings is . the number of students who have three or more siblings is .