What are the answers and please show your work. Thank you

Maria donates a fixed amount, a, to a charity each month. if she donates $300 in 12 months, what is the equation for a? a. a + 300 = 12 b. a × 300 = 12 c. a × 12 = 300 d. a + 12 = 300 e. a + 32 = 100

East black horse $0.25 total budget is $555 it'll cost $115 for other supplies about how many flyers do you think we can buy

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top