Answer:
3(x−1)=18
Answer:
x=7
Step-by-step explanation:
\frac{3\left(x-1\right)}{3}=\frac{18}{3}
x-1=6
x-1+1=6+1
x=7
Hope I helped
brainliest plz
3.5 is the IQR of <span>0,1,1,3,3,3,4,5, and 7</span>
Answer:
h. 36
Step-by-step explanation:
For a 68.26% confidence, z = 1.0.
Standard deviation (s) = 30 minutes
The sample size needed to assure that the sample mean does not differ from the true mean by more than 5 minutes is given by:
The sample size needed is 36.
Answer:
12 in.
Step-by-step explanation:
The perimeter is calculated by adding all up the sides of a shape. In this case, the shape is a square, considering that all the sides are the same measurements. 3+3+3+3 can be simplified to 3x4. This gives you 12 in. as the perimeter.
Answer:
Option B: ![y = -\frac{1}{2} x^2](https://tex.z-dn.net/?f=y%20%3D%20-%5Cfrac%7B1%7D%7B2%7D%20x%5E2)
Step-by-step explanation:
The parabola has its concavity downwards, so we need a function in the model:
![y = ax^2 + bx + c](https://tex.z-dn.net/?f=y%20%3D%20ax%5E2%20%2B%20bx%20%2B%20c)
With a negative value of 'a'
The vertex is (0,0), so we have that:
![0 = 0a + 0b + c](https://tex.z-dn.net/?f=0%20%3D%200a%20%2B%200b%20%2B%20c)
![c = 0](https://tex.z-dn.net/?f=c%20%3D%200)
The x-coordinate of the vertex is given by the equation:
![x\_vertex = -b/2a](https://tex.z-dn.net/?f=x%5C_vertex%20%3D%20-b%2F2a)
![-b/2a = 0](https://tex.z-dn.net/?f=-b%2F2a%20%3D%200)
![b = 0](https://tex.z-dn.net/?f=b%20%3D%200)
So we have a function in the model:
![y = ax^2](https://tex.z-dn.net/?f=y%20%3D%20ax%5E2)
With a < 0
The only option with this format is B:
![y = -\frac{1}{2} x^2](https://tex.z-dn.net/?f=y%20%3D%20-%5Cfrac%7B1%7D%7B2%7D%20x%5E2)