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steposvetlana [31]
3 years ago
15

A dolphin was swimming 28 meters below the oceans surface.it changed its depth to avoid a predator and ended up 21 meters below

the surface
What was the change in the dolphins depth?
Mathematics
1 answer:
Harman [31]3 years ago
6 0

Answer:

+7

Step-by-step explanation:

if you go from 28 to 21 you see there is a difference of 7 and sense the number is a smaller number now we know the dolphin went up more towards the surface there for there is a change of positive 7

28-21=7

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3 0
3 years ago
He simultaneous equations<br>5x + y = 21<br>x - 3y = 9 <br><br>With working out​
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Answer:

see explanation

Step-by-step explanation:

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Add (2) and (3) term by term

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