y
^
​
=2+
5
1
​
xy, with, hat, on top, equals, 2, plus, start fraction, 1, divided by, 5, end fraction, x
What is the residual if the room temperature was 25^\circ\text{C}25
∘
C25, degrees, start text, C, end text and the cupric chloride had an etching rate of 5\dfrac{\mu\text{m}}{\text{min}}5
min
μm
​
5, start fraction, mu, start text, m, end text, divided by, start text, m, i, n, end text, end fraction ?