Find the extrema of f subject to the stated constraint. f(x, y, z) = x − y + z, subject to x2 + y2 + z2 = 7
maximum(x, y, z)= ( )
minimum(x, y, z)= ( )

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?

Taylor wants to paint his rectangular deck that is 41 feet long and 24 feet wide. a gallon of paint covers about 350 square feet. how many gallons of paint will taylor need to cover the entire deck? round your answers to two decimal places when necessary.

What value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?