How do you know whether two quantities x and y are proportional? Every ratio yx for related pairs of x and y is equivalent.
Every sum x + y is the same for related pairs of x and y.
Every x term is a multiple of the previous term.
Every difference x – y is the same for related pairs of x and y.

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

30 ! the graph shows the number of siblings different students have. select from the drop-down menus to correctly complete the statement.

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