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If z=x2+y2z = x ^ { 2 } + y ^ { 2 }

Question 3

Multiple Choice

If z=x2+y2z = x ^ { 2 } + y ^ { 2 } , x=5tx = 5 \sqrt { t } , and y=t2ty = t ^ { 2 } - t , find dzdt\frac { d z } { d t } when t = 9.


A) -2,111
B) 10,618
C) -8,100
D) 2,473

Correct Answer:

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