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Bond [772]
3 years ago
15

……………….. 15 points!!

Mathematics
1 answer:
Softa [21]3 years ago
8 0

Answer:

1 2/7

Step-by-step explanation:

7x9=63

(7x10)-(7xa)=63

70-(7*a)=63

70-63=7*a

9=7*a

9/7=a

a=1 2/7

Hope this helps!

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1) What is the difference between a number and its positive square root is 12. Find the number
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Step-by-step explanation:

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3 years ago
Keiko, Chang, and Abdul sent a total of 109 text messages over their cell phones during the weekend. Keiko sent 7 fewer messages
lbvjy [14]

9514 1404 393

Answer:

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  • Chang: 24
  • Abdul: 68

Step-by-step explanation:

Let c represent the number of messages sent by Chang. Then Keiko sent (c-7) messages, and Abdul sent 4(c-7) messages. The total number sent was ...

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