Historically which is the oldest form of statistics?

Descriptive statistics are historically the oldest form of statistics. The brief coefficients that summarize a given data set, this can either be a representation of the entire population or a sample of it. The Descriptive statistics are further broken down into measure of variability and measure of central tendency.

5 * -2

Everyday, he takes $2, so he's going to be $2 more in debt each day. This means he's going to have -$2 each day.