Answer:
x=25 y=5
Step-by-step explanation: the c value is moving at a constant of 25 while the y value is moving at a constant of 5
Answer:
A B and D
Step-by-step explanation:
Let the number of hours she spent in baby- sitting is x
and the number of hours she spent in music lessons is y.
Now, we have been given that she worked a total of 18 hours. Hence, we have
![x+y=18\\ y=18-x...............................(1)](https://tex.z-dn.net/?f=x%2By%3D18%5C%5C%0Ay%3D18-x...............................%281%29)
And she made $139. Thus, we have
![5x+12y=139..............................(2)](https://tex.z-dn.net/?f=5x%2B12y%3D139..............................%282%29)
Substituting the value of y from equation 1 in 2, we get
![5x+12(18-x)=139\\ 5x+216-12x=139\\ -7x=-77\\ x=11](https://tex.z-dn.net/?f=5x%2B12%2818-x%29%3D139%5C%5C%0A5x%2B216-12x%3D139%5C%5C%0A-7x%3D-77%5C%5C%0Ax%3D11)
Therefore, she spent 11 hours in baby-sitting.
Hello,
1)
z=√3-i
==>ρ²=3+1=4==>ρ=2
arctg(√3/-1)=-60°
z=2∠-60°=2(cos(-60°)+i sin(-60°))
w=-2-2i
==>ρ²=4+4=8==>ρ=2√2
arctg(-2/-2)=45°
w=2√2∠45°=2√2(cos(45°)+i sin(45°))
2)
z²=(√3-i)²=3+1-2√3*i=4-2√3*i
3)w^4=(2√2∠45°)^4=(2√2)^4 ∠180° =-64+0i
You may use radian but i like more degree.