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edginutystudent
14.07.2019 •
Mathematics
The sum of a number and five is multiplied by eight. the result is equal to negative fifty-six. the value of the number is a. -12 b. 7 c. -7 d. 12
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Ответ:
Ответ:
The sum of a number (x) and 5 is muliplied by
8. This expression can be written as:
(x+5)•8
The result is equal to -56 so the equation can be written as-
(x+5)•8=-56
We can use the distributive property to muliply 8 by what is in the parenthesis.
8(5+x)
8(5) + 8(x)
40 + 8x
Once simplified 40 + 8x=-56 can represent the equation.
Now we can subtract 40 on both sides.
40 - 40 + 8x=-56 - 40
8x=-96
Then we divide by 8 on both sides to get a final answer of -12
A. -12
Ответ:
A,C and D
Step-by-step explanation:
A: 3x2=6
3x4X=12X
6+12X
C: 5x1=5
5x2X=10X
5+10X+1+2X
6+12X
D: 7x1=7
7x2X=14X
7+14X-2X-1
6+14X-2X
6+12X