The variable in an algebraic expression is represented by a letter and can vary (change). Example: "x" in "3x + 5" A constant in an expression does not change even if the variable does. Example: "15" in "x + 15"

In the expression below, identify the variable and the constant:

5z - 20

The mathematical expression 9€ t means

What is the area of triangle abc if a = 8, b = 11, and c = 15?

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%