Complex Numbers
A number in the form a + bi, where a and b are real numbers, is called a
complex number.
Contrapositive
“If p, then q,” is logically equivalent to “If not q, then not p.”
Average, Median, and Mode
Median = middle value (or average of two middle values) Mode = most
frequent value Sum of the terms = (Average) × (Number of terms)
Percent Increase and Decrease
Average Rate Formula
Permutations and Combinations