Astudent was asked to find the equation of the tangent plane to the surface z=x3−y4 at the point (x, y)=(1,3). the student's answer was z=−80+3x2(x−1)−(4y3)(y−3). (a) at a glance, how do you know this is wrong. what mistakes did the student make? select all that apply. a. the (x - 1) and (y - 3) should be x and y. b. the -80 should not be in the answer. c. the partial derivatives were not evaluated a the point. d. the answer is not a linear function. e. all of the above (b) find the correct equation for the tangent plane. z=

C) The partial derivatives were not evaluated a the point.

D) The answer is not a linear function.

The correct equation for the tangent plane is or  

Step-by-step explanation:

The equation of the tangent plane to a surface given by the function in a given point can be obtained using:

  (1)

where and are the partial derivatives of with respect to and respectively and evaluated at the point .

Therefore we need to find two missing inputs in our problem in order to use equation (1). The coordinate and the partial derivatives and . For just evaluating in the given function we obtain and the partial derivatives are:

Now, substituting in (1)

Notice that until this point, we obtain the same equation as the student, however, we have not evaluated the partial derivatives and therefore this is not the equation of the plane and this is not a linear function because it contains the terms ( and )

For finding the right equation of the tangent plane, let's substitute the values of the partial derivatives evaluated at the given point:

or

answer:

it will cost 480 dollars to refurbish the larger wood floor

step-by-step explanation:

as it's a ratio of 4 that costs 384 dollars, divide the price by the ratio

384 / 4 = 96 dollars

96 dollars per unit of the ratio

now to get the price to refurbish the larger wood floor, times the price by the units

96 * 5 = 480

7.3

step-by-step explanation: