cu punctajele obtinute la primele 3 lucrari de control, Voicu a obtinut media de 8,20. Pentru a avea media de 8,50 ,la a patra lucrare, Voicu trebuie sa obtina punctajul : a)10 b)9.90 c)9.40 d)9 Urgent va rog!!!

Each cookie sells for $0.50 sam spent $90 on baking supplies and each cookie cost $0.25 to make how many cookies does sam need to sell before making a profit formula: sales> cost

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.

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?