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QveST [7]
3 years ago
9

I need help with 19 20 21

Mathematics
1 answer:
lord [1]3 years ago
5 0
19) 5c+c=-6+2
      6c=-4
      c=-4/6
      c=-2/3

20) -20-8=-2e
       -28=-2e
       28/2=e
      14=e

21)p-2w=2l
     (p-2w)/2=l
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Imagine the United States only had two postage stamps, a 3 cent stamp and a 7 cent stamp. If you can put any number of stamps on
cricket20 [7]

Answer:

  • not possible:  1, 2, 4, 5, 8, 11
  • possible: all others

Step-by-step explanation:

Obviously, all multiples of 3 and 7 can be paid.

1 cent can be added by adding a 7-cent stamp and taking away two 3-cent stamps. 2 cents can be added by adding three 3-cent stamps and taking away one 7-cent stamp. Hence any value more than 7 +2(3) = 13 cents can always be accommodated.

Amounts that are impossible:

  1, 2, 4, 5, 8, 11 cents

All other positive integer amounts are possible.

7 0
3 years ago
14) What is the distance between −2 + 1 and 4 + 5 a) √10 b
Svetllana [295]

Answer:

\sqrt52

Step-by-step explanation:

(-2,1)=(x1,y1)

(4,5)=(x2,y2)

d=?

d=\sqrt(4+2)2 + (5-1)2\\\sqrt(6)2+(4)2\\\sqrt36+16\\\sqrt52\\

7 0
3 years ago
Which of the following statements uses the multiplicative identity?
Alex73 [517]
Times table

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division
8 0
3 years ago
Read 2 more answers
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Zina [86]

Answer:

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Step-by-step explanation:

4 0
2 years ago
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ss7ja [257]
So
1 gallon = 4 quarts
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THe answer is 16 pints
6 0
3 years ago
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