Answer:
a. 4,7
b.30,35
c.15,14
c.10,21
2.
a) 4 +3 = 7
(4, 7)
b) 30 - 5 = 25
(30, 25)
c) 15 + 3 - 4 = 14
(15, 14)
d) 10 x 2 + 1 = 21
(10, 21)
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