5. (Write each fraction in simplest form. a. 50 75 b. 105 120 6. Perform each indicated operation. Write each answer in simplest form. 3 2 3 3 a. b. 4 1 12 c. 2 15 4 9 4 12 d. 1 1 6 2 4 1 3 e. 1 3 6 5 7. (5 points) Find the LCM of the following. a. 12 and 24 b. 7, 9, and 21 12. Write each ratio or rate as a fraction in simplest form. b. 1 3 1 2 4 14.Find the unknown number n in each proportion. a. n 9 = 30 15 b. 0.1 n = 0.6 12 20. (Solve. Round all dollar amounts to the nearest cent. a. Marty borrowed $450 at 9% interest for 3 months. Find the total amount due at the end of the 3 months. b. $5000 is compounded quarterly at a rate of 10%. Find the total amount in the compound interest account at the end of 20 years. (The compound interest factor is 7.20957)