Dr. Liu wants to learn how well the students in his research methods class performed on their final exam. He added together all 25 exam scores and then divided by 25. What measure of central tendency did Dr. Liu calculate?
A) modeB) medianC) meanD) standard deviation

What the teacher is calculating is called the mean. It's given by the sum of all the individual values divided by the number of instances.

Step-by-step explanation:

What the teacher is calculating is called the mean. It's given by the sum of all the individual values divided by the number of instances.

It can't be the mode, since that would be the value that most apear in the population. It also can't be the median, since that is the value that is exactly in the half of the population and it can't the standard deviation since that is how the values are dispersed from the mean.

(f - g)(x) = 5x^3 - 3

step-by-step explanation:

rearrange these functions vertically, with like terms in separate columns:

f(x) = 5x^3 - 2

g(x) =         +1

now subtract, column by column:

(f - g)(x) = 5x^3 - 3