(a) (-7) – 8 – (-25)
= (-7) – 8 + 25
= -15 + 25 = 10
(b) First, let’s add all the positive numbers and all the negative numbers separately
(-13) + 32 – 8 – 1
= 32 - 22
= 10
(c) (- 7) + (- 8) + (- 90)
= – (7 + 8 + 90)
= -105
(d) 50 – (-40) – (-2)
= 50 + 40 + 2
= 92
Column I shows different positions in which one pole of a magnet is placed near that of the other. Column II indicates the resulting action between them for each situation. Fill in the blanks.
Column I | Column II |
N-______ | _________ |
N-________ | Attraction |
S-N | |
________-S | Repulsion |
Draw:
1) a leaf
2) a taproot and
3) a flower,
you have studied for Table 4.3