Which is an example of a quadratic function whose graph opens downward and has its vertex at (0, 1)?
o a. y=-x2 + 1
o
b. y = x2 + x - 1
o
c. y = x2 + 4x + 1
o
d. y = x2 - 1

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