The height and diameter of a cylinder are 21 cm and 12 cm. find the volume of cylinder

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

Can someone me with these two circle theorem questions asap?

When is g(x) = 0 for the function g(x) = 5.23x + 4?