by 1s is an example of an arithmetic
A sequence like: 2,
5, 8, 11..., in which you add
3 each time, is also an arithmetic sequence.
graph of an arithmetic sequence lies along
a straight line.
like: 2, 6, 18, 54..., in which you multiply
by 3 each time, is a geometric
Radioactivity is often described
by a half-life, the
time required for half the radioactive material to decay.