What is 2 4/9 as a decimal

Katlyn made 4 dresses with 7 yards of fabric. how many yards did she use on 1 dress?

Iam trying to solve a linear equation for the shoe size of someone 84" tall taking into consideration example 1 is 69" tall with a shoe size of 9 and example 2 is 72 inches tall with a shoe size of 11. i understand that the equation should be y=mx+b and that on the graph the answer is (3,2) but i just don't understand how to create the equation to solve for 84-inches and 60-inches tall questions. after two days, i need .

20 da is equal to a. 2,000 cm. b. 2 m. c. 20,000 cm. d. 20,000 mm