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a% of b=ixb=axL 100 100 change percent change = ——— original Statistics average (mean) sum of terms creg number of terms median = middle number (or average of 2 middle numbers) mode = most common number range = biggest smallest Probability and Counting Techniques number of desired terms bability = peo R total number of terms P(event happens) + P(event doesn't happen) =1 P(A and B)=P(A4)xP(B) GEOMETRY Lines and Angles supplementary angles add to 180° complementary angles add to 90° vertical angles are congruent Triangles angles of a triangle add to 180° area of a triangle = %x base x height Pythagorean theorem: a* +b* = ¢'
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