12. Jack decided to park at a local parking garage. the garage charged $4.25 per hour also a $5 flat fee to enter the garage. Write a linear equation for the total cost T for parking h hours (SHOW ALL WORK)

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x,y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis