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Answers
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:
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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