3a.) If you are at -20 feet, how far would you need to go to get to 10 feet? (Think: what should you add to -20 to get to 10?)

-20+30=10        Add 30 ft

Step-by-step explanation:

If you subtract 20 from -20 you get 0 now if you add 10 you get 10 equal to the number you need to be equivalent to. 20+10=30 your answer is 30. You should add 30 to -20 to get 10.

i believe the answer is c.

could you provide figure.