Determine 25% of 180 by expressing the percent as a decimal.

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Asequence {an} is defined recursively, with a1 = 1, a2 = 2 and, for n > 2, an = an-1 an-2 . find the term a241

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.