How would I simplify by combining like terms. -5a - 4a + b

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Could someone with number 1 and 2

Determine the common ratio and find the next three terms of the geometric sequence. 10, 2, 0.4, a. 0.2; -0.4, -2, -10 c. 0.02; 0.08, 0.016, 0.0032 b. 0.02; -0.4, -2, -10 d. 0.2; 0.08, 0.016, 0.0032 select the best answer from the choices provided a b c d