They must learn that an object still exists even though they can’t see it.
Answer:
17= A
18= B
Hopefully this helps !
(1) 9*4 - 4c = x
(2) 9*2 +2c = x
∴ 36 - 4c = 18 + 2c
18 - 4c = 2c
9 - 2c = c
9 = 3c
c = 3 mph
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