Answer:
ok
Step-by-step explanation:
Applying implicit differentiation, it is found that dy/dt when y=π/4 is of:
a-) -√2 / 2.
<h3>What is implicit differentiation?</h3>
Implicit differentiation is when we find the derivative of a function relative to a variable that is not in the definition of the function.
In this problem, the function is:
xcos(y) = 2.
The derivative is relative to t, applying the product rule, as follows:


Since dx/dt=−2, we have that:

When y = π/4, x is given by:
xcos(y) = 2.

Hence:


Since cot(pi/4) = 1, we have that:

Which means that option a is correct.
More can be learned about implicit differentiation at brainly.com/question/25608353
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Okay, I will try to help you the best I can!!
Answer:
they will need to win 18/20 matches
Step-by-step explanation:
if winning 9/10 matches gives them a winning percentage of 90% then you take 9/10 and multiple it by 2 since they played two times the matches of 10, then you get 18/20
$3 per person
6 times 4 = $24
36 - 24 = 12
12 divided by 4 = 3