You have $8 and earn $1.25 for each health bar you sell. Write an equation in two variables that represent the total amount A (in dollars) you have after selling b health bars.

What is the result of adding the system of equations? 2x+y=4 3x-y=6

If each bricks costs and he can only buy one brick how much will it cost him to get the material to put around the outside of his garden?

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.