What calculation is modeled on the number line? H
-13 -1
0
1
2
- 1o + (-110) = -1;
+(-1) ---
10
-- + (-5)= -1;
- + (-1}) = -2
Done

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)

What is the area of the shaded sector?