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Answer:
20
Step-by-step explanation:
I'll use subscript notation for brevity, i.e.
.
By the chain rule,



We have

and

When
, we have

and the partial derivatives take on values of

So we end up with

Answer:
(a)
Step-by-step explanation:
Given
4x - 1 = x ( subtract x from both sides )
3x - 1 = 0 ( add 1 to both sides )
3x = 1 ( multiply both sides by 10 )
30x = 10 → (a)