What the answers for it

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

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.