13a. A scale drawing of a movie screen is 9 inches tall. The actual screen is 30 feet tall. What is the scale of the drawing?
13b. A scale drawing of a movie screen is 9 inches tall. The actual screen is 30 feet tall. What is the scale factor of the drawing? (Use your answer from #13a to help get your answer for this problem.)

The administrator of a large assisted living facility wanted to know the average age of the residents living at the facility. he randomly selected 12 residents and determined their age, listed here: 80, 65, 75, 83, 68, 73, 88, 79, 94, 72, 79, 68 what's the average age of the sample of residents? a. 79 years old b. 68 years old c. 75 years old d. 77 years old

Use complete sentences to differentiate between a regular tessellation, and a pure tessellation. be sure to include specific types of polygons in your explanation.

Ibeg you to me 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?