Brenda is making a dessert that takes 3.5 hours to prepare. if she wants to be finished by 1: 15, at what time should she start?

Hey there I see you need help well I am here to do just that, so your answer would be 9:45 because there is 60 minutes in an hour so 3.5 hours from 9:45 would be 1:15 so the correct answer is : 9:45

Hope this helps if so why not hit that brainllest answer button ;)
there are 60 minutes in an hour so she should start at 9 ;45

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.