3 to the power of 5 x 3 to the power of 3

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

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?