A driver is below the surface of the water at - 15m. he dives down by 6m, then rises 4m.
The current location of the driver.
In this problem, negative sign is used for downward direction or the distance below the surface of the water.
Initial location = -15 m
Dives down by 6m, it means - 6m, then rises 4m, it means 4 m.
Now, the current location is
Therefore, the correct location of the driver is at -17 m it means her is 17 m below the surface of the water.
walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40
20 ≤ x + 15 ≤ 55
subtract 15 from all parts
20-15 ≤ x + 15-15 ≤ 55-15
5 ≤ x ≤ 40
this means how many more cookies he has to make
walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40