Question

please solve my problems fast

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Answer 1

Answer:

1) -20+10 = -10

2)a = -12 ,b = 4 , c = -25

a) a+b = b+a

-12+4 = 4+(-12)

-8. = -8

b) a+(b+c) = (a+b)+c

-12+(4-25) = (-12+4)+(-25)

-12 + (-21) = (-8)+(-25)

-33 = -33

3) a) -17-(-15) = -17+15 = -2

b) 15+(-28) = 15-28 = -13

4) -392+(-5)+(-8)+(-15)

-392-5-8-15

-420

5) -327+x = -450

x = -450+327

x = -123

6) a) 25,20,15,10,5,0,-5

b) -3,-9,-12,-15,-18,-21

7) 1050+300 = 1350m

8)105 - x = -63

-x = -63-105

-x = -168

x = 168

Answer 2

Answer:

1. -20 & + 10

2. a. True

b. True

3. a. -2

b. -13

4. -420

5. -123

6. a . 5, 0, -5

b. -15, -18, -21

7. -1350

8. -168

Step-by-step explanation:

2.a.

= -12 + 4 = 4 + (-12)

= -8 = 4-12

-8 = -8.

2b. a + (b + c ) = ( a + b ) + c

-12 + (4 + (-25) ) = (-12 + 4) + (-25)

-12 + (-21) = -8 + (-25)

-12 - 21 = -8 -25

-33 = -33

3. a. -17 - (-15)

-17 + 15

-2

b. 15 + (-28)

= 15 - 28

= -13

4. -392 + (-5) + (-8) + (-15)

= -392 - 5 - 8 - 15

= -420

5. x = a + b

-450 = (-327) + x

x = +327 - 450

x = -123

7. Position of the submarine= -1050 m

descent= 300m

New position= -1050- 300

                 = -1350

8. a - b = c

105 - x = -63

x = 105 + 63

x = 168

x = -168.

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