Answer:

Step-by-step explanation:
The figure is composed of two similar triangles; therefore,
<em>this says the ratio of the sides is same for the two triangles.</em>
we simplify and a rearrange to get

which we expand and get


this quadratic equation has solutions


As integers and simplified fractions these are

Answer:
No, Method is not effective.
Step-by-step explanation:
Let x be the number of girls = 319
and n be the total number of babies = 580
Then, proportion

Standard Error,

The level of significance is:

Confidence Interval:
![p \pm [Z_{\frac{\alpha}{2}} \times SE]\\=0.550 \pm [2.575 \times 0.02066\\=(0.4968, 0.6032)](https://tex.z-dn.net/?f=p%20%5Cpm%20%5BZ_%7B%5Cfrac%7B%5Calpha%7D%7B2%7D%7D%20%5Ctimes%20SE%5D%5C%5C%3D0.550%20%5Cpm%20%5B2.575%20%5Ctimes%200.02066%5C%5C%3D%280.4968%2C%200.6032%29)
Since 0.50 lies in the interval hence we fail to reject

Thus, the method does not appear to be effective.
Answer:
This is the answer In Step 2, the associative property cannot regroup addition and multiplication.
Step-by-step explanation:
Hope this helped.
Answer: x = 4
Explanation: root x-1 = 2- root x+3
First let’s take out the root by square both side by 2 we get:
x-1= 4-x+3
x-1 = -x+7
x+x = 7+1
2x= 8
x= 8/2=4