Evaluating expression a - 5 - b; use a = 10, and b = 4

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).

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)

What is the measure of angle x? a.101 b.158 c.44 d.79