How dose the scientist know that the substance goes through a change of state during the time period labeled B on the graph. P. s this is actually science i cant find the subject for science so who ever answers this will resive a prize

The car wash owner uses the equation y=x+44 to model the data, where x represents the number of days the business has been open and y represents the number of cars washed.

Alex is the head photographer for the yearbook and the newspaper. she has a large staff of assistant photographers because they need to take pictures at all of the school events. she knows that some of her photographers have better cameras and can take action shots at sporting events, and that some of them are good at taking candid pictures in the hallways. she sets firm deadlines so she has enough time to look through all of the shots and choose the best ones. she gives her photographers constructive feedback to them improve their pictures. respectful enforcer warlord doormat peacemaker

Jerrold has to buy 12 copies of a textbook which costs $36.25 per copy. how much must he spend for them?