Answer:
pretty sure she did something wrong in the 1st step, it specifically said to do 6.1-4.5, but she changed the parathenesis, resulting in a different answer
Hello :
the consecutive room numbers are : n , n+1
n(n+1) =420
n²+n -420 = 0
the discriminant delta = b² - 4ac ( a = 1 and b = 1 and c = - 420
delta = (1)²-4(1)(-420) =1681= 41²
n = (-1 -41)/2 ( refused negatif number)
or
n = (-1+41)/2 =20
<span> the room numbers.are : 20 , 21</span>
586/10 -> 293/5 -> 58 3/5
Answer: x = 7.2, y = 7.5
<u>Step-by-step explanation:</u>
Similar triangles have the same proportions.
Since ABC ≅ DEF, then 
<u>Let's solve for x:</u>

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<u>Let's solve for y:</u>

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Answer:
They do often times. There's not really much to tell about it. They can have multiple, they can go on and on.