Verified answer

1. ab-cd

• (2)(-1) - (3)(-5)
• -2 + 15
• 13

2. a + b + c + d

• 2 + (-1) + 3 + (-5)
• 2 - 1 + 3 - 5
• 1 - 2
• -1

3. a + b - c + d

• 2 + (-1) - (3) + (-5)
• 2 - 1 - 3 - 5
• 1 - 3 - 5
• -2 - 5
• -7

4. 2a+2b-3c

• 2(2) + 2(-1) - 3(3)
• 4 - 2 - 9
• 2 - 9
• -7

1. 13
2. -1
3. -7
4. -7

Answer:

1. 2(-1)-3(-5)

=-2+15

=13

2. 2+(-1)+3+(-5)

=1+3+(-5)

=4+(-5)

=-1

3. (2)+(-1)-3+(-5)

=2+(-4)+(-5)

=-2+(-5)

=-7

4. 2(2)+2(-1)-3(3)

=4+(-2)-9

=4-9

=-7

Step-by-step explanation:

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