Ricardo’s employee pays 90% of the total cost of his family’s health insurance plan while ricardo pays the rest. if the total cost of the plan will increase from $550 per month to $700 per month how much more will ricardo have to pay each month?

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.