What is 12.405 as a mixed number in simplest form

What rule describes a dilation with a scale factor of 4 and the center of dilation at the origin?

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.

Find the measure of anglec in the following triangle