√9 = 3 and is rational
Its C
Answer:
(5sqrt(2), 45 deg)
(-5sqrt(2), 225 deg)
Step-by-step explanation:
(x,y)=(5,5)
So theta=arctan(5/5)=arctan(1)=45 degrees
Now r! r=sqrt(x^2+y^2)=sqrt(5^2+5^2)=sqrt(50)=sqrt(25)sqrt(2)=5sqrt(2)
So one polar point is (5sqrt(2) , 45 degrees)
Now if we do 180+45=225 degrees... this puts us in the 3rd quadrant... to get back to quadrant 1 we just take the opposite of our r
so another point is (-5sqrt(2) , 225 degrees)
Answer:
y=x-4
Step-by-step explanation:
I graphed this out and got the equation.
Answer:
B
Step-by-step explanation:
The square of a certain negative number is equal to 5 more than one half of that number
what is that number
let x be that number
thus x² = x/2 + 5
x² - x/2 - 5 = 0
2x² - x -10 = 0
(2x-5) (x + 2) = 0
x = 5/2 or - 2
so the number is - 2