Answer:
Step-by-step explanation:
put x=r cos θ
y=r sin θ
r²cos²θ-r²sin²θ=3rsin θ
r²(cos²θ -sin²θ)=3r sin θ
r²cos 2θ=3rsinθ
r cos 2θ=3 sin θ
r=3sec 2θ sin θ
Answer:
8 weeks
Step-by-step explanation:
48 is 75%
x is 100%
48×100=4800
75x=4800
x=4800:75
x=64
64-48=16
16:2=8
Answer is 8 weeks
The cost of the mp3 player after the discount is $27.98.
<h3>
What is percentage?</h3>
A percentage is a number or ratio that can be expressed as a fraction of 100. If we have to calculate percent of a number, divide the number by whole and multiply by 100.
Given
An mp3 player is on sale for 30% off the regular price of $39. 98.
The price of the mp3 player after the 30% is given

The cost of mp3 player after 30% discount is;
= $39.98 - $11.99 = $27.98
Hence, the cost of the mp3 player after the discount is $27.98.
To know more about percentage click the link givem below.
brainly.com/question/9776399
Solving the expression
we get value of x: 
Step-by-step explanation:
We need to solve the equation
and find value of x
Solving:
![-[-2(x-4) - |1-3|] = -2x18](https://tex.z-dn.net/?f=-%5B-2%28x-4%29%20-%20%7C1-3%7C%5D%20%3D%20-2x18)
Multiply -2 with terms inside the bracket
![-[-2x+8 - |1-3|] = -2x18](https://tex.z-dn.net/?f=-%5B-2x%2B8%20-%20%7C1-3%7C%5D%20%3D%20-2x18)
Solving |1-3| we get |-2|=2
![-[-2x+8 - 2] = -2x18](https://tex.z-dn.net/?f=-%5B-2x%2B8%20-%202%5D%20%3D%20-2x18)
![-[-2x+6] = -2x18](https://tex.z-dn.net/?f=-%5B-2x%2B6%5D%20%3D%20-2x18)
Multiply (-) sign with terms inside the bracket

Multiply 2x with 18

Add 36x on both sdides


Add 6 on both sides:

Divide both sides by 38

Simplifying:

So, Solving the expression
we get value of x: 
Keywords: Solving Equations
Learn more about Solving Equations at:
#learnwithBrainly
I think its d !! I’m not sure