Which is bigger 0.6 or 0.58? increase £80 by 20%? decrease £600 by 20%?

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.

In a certain city, the hourly wage of workers on temporary employment contracts is normally distributed. the mean is $15 and the standard deviation is $3. what percentage of temporary workers earn less than $12 per hour? a. 6% b. 16% c. 26% d. 36%

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.