Answer:
2.3
Step-by-step explanation:
A number when squarerooted squared will be come that number.
In formula terms, it is something like that:
![\sqrt{x} X \sqrt{x} =x](https://tex.z-dn.net/?f=%5Csqrt%7Bx%7D%20X%20%5Csqrt%7Bx%7D%20%3Dx)
So…
![\sqrt{2.3} X \sqrt{2.3} = 2.3](https://tex.z-dn.net/?f=%5Csqrt%7B2.3%7D%20X%20%5Csqrt%7B2.3%7D%20%3D%202.3)
Answer:
D. 3
Step-by-step explanation:
48x=8
x=6
18/6=3
Answer:
A.
Step-by-step explanation:
![y=2x+4](https://tex.z-dn.net/?f=y%3D2x%2B4)
![y=x^2+x-2](https://tex.z-dn.net/?f=y%3Dx%5E2%2Bx-2)
Both equations are solved for y so I'm just going to substitute
the 1st y (the 2x+4) into the second equation's y.
![2x+4=x^2+x-2](https://tex.z-dn.net/?f=2x%2B4%3Dx%5E2%2Bx-2)
I'm going to get everything on one side so I have 0=ax^2+bx+c.
Subtract 2x and subtract 4 on both sides:
![0=x^2-x-6](https://tex.z-dn.net/?f=0%3Dx%5E2-x-6)
Since the coefficient of x^2 is 1, all we have to do is find two numbers that multiply to be -6 and add up to be -1.
These numbers are -3 and 2.
So the factored form of our equation is:
![0=(x-3)(x+2)](https://tex.z-dn.net/?f=0%3D%28x-3%29%28x%2B2%29)
This means we have x-3=0 or x+2=0.
x-3=0
Add 3 on both sides:
x=3
x+2=0
Subtract 2 on both sides:
x=-2
So now we need to find y. I'm going to choose to use the easier equation:
y=2x+4.
If x=3, then y=2(3)+4=6+4=10. The ordered pair (3,10) is a solution.
If x=-2, then y=2(-2)+4=-4+4=0. The orded pair (-2,0) is a solution.
Answer:
390 seniors
Step-by-step explanation:
13/20=.65
600x .65=390