Help. I have a hard time doing these problems

Mathematics

1 answer:

11Alexandr11 [23.1K]4 years ago

3 0

1. 18 feet below sea level because he was 15 feet then he rose 9 feet then went down 12 feet so 15 - 9 = 6 then 6 + 12 = 18

2. 23 + 5 = 28 and 28 - 7 = 21 so 21

3. 67 cause 50 - 40 = 10 and 10 + 87 = 97 and 97 - 30 = 67

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