Answer:
The number Gavin was thinking of is -78.
Step-by-step explanation:
-78 +1= -77
-77/7 = -11
To solve I did:
-11 * 7
-77
-77-1= -78
700 feet
you just add the two 50 wich makes that 100 then add 100 to 600
a . 90⁰
hope it will help you