Parameterize
by

with
and
.
Then the surface element is

and the surface integral is

we know that the quatraitic equation
we know that the quadratic equation is aX square + bx + c we put this value A and B and C in equation X square + bx + c
Answer:
The number that is halfway between 4 and 5 is
so that is the answer.
Y = 16.14z ; the constant of proportionality is 16.14. It is called constant of proportionality because it never changes. It remains constant or the same. Whatever the value of z is, y is directly proportional to z by the rate of the constant of proportionality.