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step-by-step explanation:

1) 0

  sea level   is 0   above sea level positive numbers below sea level negative numbers

2)-66   below sea level number

3) answer   2 degrees

1 grade per hour total 5 more grades

    from -3 to 0 = 3 degrees

    from 0 to 2 =   2 degrees

4)   11

imagine   a number line. you are on the left side   on   -4

you start moving to the right to reach positive 7

from -4 to 0=4 4 units (or jumps)

from 0 to positive 7=7 units

4+7 =11 degrees warmer