Noa drove from the Dead Sea to Jerusalem, and her altitude increased at a constant rate of 740 meters per hour. After 1.5 hours of driving, she arrived in Jerusalem at an altitude of 710 meters above sea level.

To determine the altitude of the starting point (Dead Sea), we can use the information provided about the rate of altitude increase and the time it took Noa to reach Jerusalem.

Given that Noa's altitude increased at a constant rate of 740 meters per hour and it took her 1.5 hours to reach Jerusalem, we can multiply the rate of increase by the time to find out how much her altitude changed during the trip.

Change in altitude = Rate of altitude increase × Time Change in altitude = 740 meters per hour × 1.5 hours Change in altitude = 1110 meters

Now we know that the change in altitude is 1110 meters, and Noa ended up at 710 meters above sea level in Jerusalem. We can deduce that the starting altitude was 710 meters (Jerusalem's altitude) minus 1110 meters (the change in altitude).

Starting altitude = Altitude in Jerusalem - Change in altitude Starting altitude = 710 meters - 1110 meters Starting altitude = -400 meters

Therefore, Noa started her journey from an altitude of -400 meters below sea level.