(a)
![P(4\ out\ of\ 4)=0.8^{4}=0.4096](https://tex.z-dn.net/?f=P%284%5C%20out%5C%20of%5C%204%29%3D0.8%5E%7B4%7D%3D0.4096)
(b)
![P(2\ out\ of\ 4)=4C2\times 0.8^{2}\times0.2^{2}=0.1536](https://tex.z-dn.net/?f=P%282%5C%20out%5C%20of%5C%204%29%3D4C2%5Ctimes%200.8%5E%7B2%7D%5Ctimes0.2%5E%7B2%7D%3D0.1536)
![P(3\ out\ of\ 4)=4C3\times0.8^{3}\times0.2=0.4096](https://tex.z-dn.net/?f=P%283%5C%20out%5C%20of%5C%204%29%3D4C3%5Ctimes0.8%5E%7B3%7D%5Ctimes0.2%3D0.4096)
P(4 out of 4)=0.4096
P(at least 2) = 0.1536 + 0.4096 + 0.4096 = 0.9728
First off 3/9 and 6/9 are already common denominators. In some fractions you would need to find the least common denominator like in a problem like 1/2 + 4/5. Also 3/9 plus 6/9 results in 9/9 and 9/9 equals 1. Most fractions adding it subtracting results in a pan answer as a fraction but in this case it’s a whole number.
Add up the same sides of both equations to eliminate <em>x</em> :
(<em>x</em> - 2<em>y</em>) + (-<em>x</em> + 3<em>y</em>) = 8 + (-5)
(<em>x</em> - <em>x</em>) + (-2<em>y</em> + 3<em>y</em>) = 8 - 5
<em>y</em> = 3
Then
<em>x</em> - 2<em>y</em> = <em>x</em> - 6 = 8 → <em>x</em> = 14
You can probably look up a answer key for that worksheet. ;)
Answer:
11:50
Step-by-step explanation:
Go back 40 min before 12:20