Sally is making a model building using a scale in which 1/2 inch equals 30 feet. if the building is 400 feet, how wide is the model, in inches?

Plzz help I'm so stuck!!

Which of the following are independent events? a) knowing that it is going to rain tomorrow, and bringing an umbrella to schoolb) knowing that you have to get up early tomorrow, and going to bed before 9 p.mc) knowing that it is going to rain tomorrow, and going to bed before 9 p.md) knowing that you have a test in school tomorrow, and studying thw night before