solve these questions

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

Solve the triangle. a = 21°, c = 105°, c = 5

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