We know that the balloon ascends at the same constant rate, that means that after the penny drop is:

this comes from the fact that the initial height is 500 ft and that for each second the balloon ascends 10 feet.
The answer is b because I had that question on a test before
I'm assuming they just want you to simplify the expression:
1/2 × 6 + 11
3 + 11
14
Answer: [0,+infiniti)
Step-by-step explanation:
Answer:
15 - 2 + v
Step-by-step explanation:
i'm not to sure i asked my friend and she's very smart so i think thats ir
*sorry if its wrong*