Write the differential dw in terms of the differentials of the independent variables w=f(x, y,z) = sin (7x + 4y - 5z) *dw = (_)dx + (_)dy+ (_)dz​

Acompany charges $0.10 for each letter engraved. bobby plans to spend no more than $5.00 on the engraving on a jewelry box. write and solve an inequality to find the maximum number of letters he can have engraved.