A22 gram sample of a substance thats used to preserve fruit and vegetables has a k value of 0.1011. find the half life rounded to the nearest tenth

Use the radius you found in part i (r=26.8 cm) with the surface area formula below to find the surface area of the sphere. show your work and round your answer to the nearest tenth. the surface area of a sphere: sa = 4πr^2 self note: 3.8.4

Can someone pls ! pls answer all. no explanation needed..

Your friend uses c=50p to find the total cost, c, for the people, p, entering a local amusement park what is the unit rate and what does it represent in the context of the situation?