The layer of gold coating on a ring should be 0.03 millimeters thick when the ring is completed. a coating of 0.021 millimeters has already been applied. how many more millimeters of gold coating must be added to finish the ring? a. 0.018 millimeters b. 0.009 millimeters c. 0.18 millimeters d. 0.09 millimeters

d 192

step-by-step explanation:

we find our area to find area we multiply thoses numbers to get our answer so our area is 192

it's

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c