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posledela
3 years ago
8

I need help with 7.68+13.07

Mathematics
2 answers:
horrorfan [7]3 years ago
6 0
The answer for that would be 20.75
GalinKa [24]3 years ago
3 0
The answer is 20.75
1    1
13.07
+7.68
---------
 20.75
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-11 X +4+ 8X -4+ 3X equals
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Answer:

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Step-by-step explanation:

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Squareroot(y-1) + 3 = y
jek_recluse [69]
Note:xy means x times y and x(y) means the same thing

so
first we get rid of square root then
make the equation equal to zero becaues if
xy=0 then x or/and y=0



squareroot(y-1)+3=y

isolate the squareroot
subtrac 3 from boht sides

squareroot(y-1)=y-3

square both sides (since they are equal, you should be able to square both sides and still make it true)

(squareroot(y-1))^2=(y-3)^2
(y-1)=(y-3)(y-3)
y-1=y^2-6y+9
subtrac y from both sides
-1=y^2-7y+9
add 1 to both sides
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find what two number multiply to make 10 and add to get -7
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0=(y-5)(y-2)
therfore
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and/or
y-2=0

therefor
y=5 or/and 2 might work
let's try out 2
square root(2-1)+3=2
square root(1)+3=2
1+3=2
false
so 2 doesn't work



let's try 5
squareroot(5-1)+3=5
squareroot(4)+3=5
2+3=5
5=5
true

y=5
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