The following are the ages (years) of 5 people in a room: 23, 19, 12, 21, 13 A person enters the room. The mean age of the 6 people is now 19. What is the age of the person who entered the room?

Is the open sentence 5x-2=3x+2 true when x=2? justify your answer.

Find the volume of the described solid.the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x.a) 441b) 147c) 864d) 882

If you could answer these your a life saver