1.) the sun of two number times a third number is equal to the sum of each addend times the third number

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?

Find the maximum value of p= 4x + 5y subject to the following constraints :

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?