Why do scientists need an accurate atomic model

If chord ab is congruent to chord cd, then what must be true about ef and eg?

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 %

During a wright loss challenge your friend goes from 125 pounds to 100 pounds.what was the percent weight loss