Wyatt works as a salesperson at an electronics store and sells phones and phone accessories. Wyatt earns a $10 commission for every phone he sells and a $3 commission for every accessory he sells. On a given day, Wyatt made a total of $60 in commission from selling a total of 13 phones and accessories. Graphically solve a system of equations in order to determine the number of phones sold, x, and the number of accessories sold, y.

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 %