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scoundrel [369]
3 years ago
12

4y + 12 = 7 - 5y thank you :)

Mathematics
2 answers:
Sauron [17]3 years ago
6 0
Y=-5/9, first you distribute 4 to y and 3, then use elimination, but remember what you do to one side you have to do to the other.
riadik2000 [5.3K]3 years ago
3 0
Y= -5 i am pretty sure
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The size of angle aob is equal to 132 degrees and the size of angle cod is equal to 141 degrees. find the size of angle dob.
Varvara68 [4.7K]

angle AOB = 132 and is also the sum of angles AOD and DOB. Hence 
angle AOD + angle DOB = 132°    ---> 1 

angle COD = 141 and is also the sum of angles COB and BOD. Hence 
angle COB + angle DOB = 141°    ---> 2

Now we add the left sides together and the right sides of equations 1 and 2 together to form a new equation. 

angle AOD + angle DOB + angle COB + angle DOB = 132 + 141       ---> 3 

We should also note that: 
angle AOD + angle DOB + angle COB = 180° 

Therefore substituting angle AOD + angle DOB + angle COB in equation 3 by 180 and solving for angle DOB:
180 + angle DOB = 132 + 141 
angle DOB = 273 - 180 = 93° 

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Hunter-Best [27]

Answer:

410/1080=(0.915)^x

0.379=(0.915)^x

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X=10.903

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