Two rooms were used to exhibit paintings. The number of paintings in room A was 7/9 of the number of paintings in room B. When 1/3 of the paintings in room B were moved to room A, there were 8 more paintings in room A than in room B. Find the number of paintings in Room a and Room B at first

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?

Answer for 10 points show work you guys in advanced < 3

Sara goes on a slingshot ride in an amusement park. she is strapped into a spherical ball that has a radius 3*10^2 of centimeters. what is the volume of air in the spherical ball? use this formula: volume of a sphere=4/3pi,r^3 , where r is the sphere’s radius.