Write as a mathematical expression and solve. The sum of a number and 2 times the number is 21. Find the number.

How do you summarize data in a two-way frequency table?

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?