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1. What number must be added to:
a. –10 to give –5
b. 20 to give –10
c. 38 to give 0
2.what must be subtracted from:
a. 9 to give –4
b. –12 to give 7
c. 11 to give 15​

1 What Number Must Be Added Toa 10 To Give 5 B 20 To Give 10 C 38 To Give 02what Must Be Subtracted Froma 9 To Give 4b 12 To Give 7c 11 To Give 15 class=

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MAILYNMADRIAGA4IN

Let x be the missing number.

[tex]1. questions \: be \: like \: this\: \: \\ a) \: - 10 + x = - 5 \\ b) \: 20 + x = - 10 \\ c) \: 38 + x = 0 \\ \\ 2.questions \: be \: like \: this \\ a) \: 9 - x = - 4 \\ b) \: - 12 - x = 7 \\ c) \: 11 - x = 15[/tex]

Answers:value of x

1.

  • a) 5
  • b) –30
  • c) –38

2.

  • a) 13
  • b) –19
  • c) 4

Step by step:

1.

a)

  • –10+x=–5
  • x=–5+10
  • x=5

b)

  • 20+x=–10
  • x=–10–20
  • x=–10+(–20)
  • x=–30

c)

  • 38+x=0
  • x=–38

2.

a)

  • 9–x=–4
  • –x=–4–9
  • –x=–13
  • x=13

b)

  • –12–x=7
  • –x=7+12
  • –x=19
  • x=–19

c)

  • 11–x=15
  • –x=15–11
  • –x=4
  • x=–4

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