(03.01) is the following relation a function? y equals the sine of 3 x

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?

The edge of a cube was found to be 30 cm with a possible error in measurement of 0.4 cm. use differentials to estimate the maximum possible error, relative error, and percentage error in computing the volume of the cube and the surface area of the cube. (round your answers to four decimal places.) (a) the volume of the cube maximum possible error cm3 relative error percentage error % (b) the surface area of the cube maximum possible error cm2 relative error percentage error %

Ihonestly have no clue if it's each or none.