sequence in which successive terms differ by the same constant amount.
(3, 5, 7, 9)
sequence in which the ratio of successive terms is a constant.
(2, 4, 8, 16)
total distance/total time
-4, -3, -2, -1, 0, 1, 2, 3, 4,
(Note: zero is neither positive nor negative.)
2, 3, 5, 7, 11, 13, 17, 19,
(Note: 1 is not a prime and 2 is the only even prime.)
x^a * x^b
x^a * y^a
x^a / x^b
x^a / y^a
1 / x^a
b *(the square root of) x^a
variable y is directly proportional to the variable x if there exists a nonzero constant k such that y = kx.
The variable y is inversely proportional to the variable x if there exists a nonzero constant k such that y = k/x or xy = k.
y = a (x - h)2 + k, where the vertex of the parabola is at the point (h, k) and a ≠ 0. If a > 0, the parabola opens upward; and if a < 0, the parabola opens downward.