Whats the area of a circle if the diameter is 24.26 mm

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

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Alicia puts $400 in a bank account. each year the account earns 5% simple interest. how much money will be in her bank account in six months?