I'll explain how to do the first one:-
y = cos-1(x2)
This can be described as ' a function of a function' x^2 is a function of x and cos-1(x^2) is a function of x^2.
We need to apply the chain rule.
Personally I find this easier to understand if i let u = x^2, so
If y = f(u) and u is a function of x then
dy/dx = dy/ du * du/dx
Here u = x^2 and y = cos-1(u)
du/dx = 2x
so dy/dx = d(cos-1(x^2) dx = dy/du * du/dx
= -1 / √(1 - u^2) * 2x
= -2x / √(1 - u^2)
= -2x / √(1 - (x^2)^2)
= -2x / √(1 - x^4)
I hope this helps. but if not. you might like to employ the formulae in the question - The square boxes contain the 'u' s in my answer. These formulae are equivalent to my explanation.
What is the question can't help with ought it
7 Days
25/5 cups of bird seed to start with and subtract 3/5 from it until you run out of bird seed
Answer:
$400
Step-by-step explanation:
Given at the end of 2017 estimated warranty payable is $ 1,300
Also given that During 2018, Roy Electric made sales of $ 140,000 and expects product warranties to cost the company 1 percent of the sales
The warranties made in the year 2018 is 
Given that the company already paid $2300 warranties so
Total warranties payable are 1300 + 1400 - 2300 = $400
First, you subtract 16r by 9r, which gives you 7r, so that leaves you with 8 + 7r. You cannot add a normal number and a number with a variable, so that's all you can do, so your answer is A.
