Final answer:
Austin helped pay for his mom's medical bills by working a part-time job, applying for financial assistance programs and grants, and organizing a fundraising campaign.
Step-by-step explanation:
Austin helped pay for his mom's medical bills by taking on a part-time job and using his earnings towards the bills. He also applied for financial assistance programs and grants that were available to help cover medical expenses. In addition, Austin organized a fundraising campaign within his community to raise money for his mom's medical bills.