4 years ago

Can someone help?

Mathematics

1 answer:

lutik1710 [3]4 years ago

3 0

Answer:

21(a) 8 cm

21(b) 1.6 cm/sec

Step-by-step explanation:

21(a)

21 cm = 13 cm = 8 cm

21(b)

Increase in depth from 6 sec to 11 sec: 8 cm

Time from 6 sec to 11 sec: 11 sec - 6 sec = 5 sec

Rate = (8 cm)/(5 sec) = 1.6 cm/sec

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