Mario has 400$ more than John has in his bank account. If the amount of money in john’s bank account is represented by D, write an expression to represent how much mario has. Find The key words:

Define the variable

Write the Expression

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

2x minus y equals 6, x plus y equals negative 3

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 %