I don’t understand and need help please. Thank you

1foot = 12 inches; 1 yard = 3 feet

Which of the following circles have their centers on the x-axis? check all that apply.

After reading 80% of her e-mails in her inbox, danette still has m unread e-mails. which of the following expressions could represent the number of e-mails danette had in her inbox before she started reading? choose 2 answers: (choice a) 5m (choice b) 1.8m (choice c) 80m (choice d) m/0.8 (choice e) m/1−0.8