The amount of food energy required each day for outside workers in Canada can be modelled by the formula E = –125T + 15 250, where E is the amount of food energy, in kilojoules (kJ), and T is the outside temperature, in degrees Celsius. a) Rearrange the formula to isolate T.
b) For what temperature is 14 000 kJ of food energy needed each day?

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?