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jasenka [17]
4 years ago
8

Solve. −9.8+(−5.9)+u=−12.4 u=? A: 3.3 B:-8.5 C:-28.1 D:15.7

Mathematics
2 answers:
Finger [1]4 years ago
8 0
The best way to solve this is to simply substitute all given answers for u.

The answer is A) 3.3
nasty-shy [4]4 years ago
4 0
The answer is A, 3.3. You first want to distribute the + symbol to the 5.9, which will make it still a negative. From then you want to combine like terms so you can add -9.8+-5.9. That should be equal to -15.7. Your equation now is looking like -15.7+u=-12.4. You want to leave the u alone so now you have to do the opposite of -15.7 which is add 15.7. What you do to one side, you do to the other. Now add 15.7 to -12.4. That should be 3.3. Now it looks like u=3.3 which is your answer.
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rank | 1st | 2nd |TOTAL
------|-----+-------|----------
a     | 6   +    9   |  =15
b     | 7   +   3    | =16
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e     | 8   +  1     | =?


If you add the 1st in line a (6) and you add it to the 1st in line b (7) + the 2nd in line b (3) you get 16. Repeat the same logic/pattern to all c,d..
This is the pattern to all this puzzle;

So the before last term is :  9+6+7 = 22
and the last term : 6+8+1 = 15


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