How many seconds are in 9 minutes?

A) 420 seconds
B) 480 seconds
C) 540 seconds
D) 560 seconds

Answers; a) 135 degree’s b) 30 degree’s c) 180 or 0 degree’s d) 90 degree’s

Pls! does anybody know a shortcut for answering these types of questions in the future?

Miranda is braiding her hair.then she will attach beads to the braid.she wants 1_3 of the beads to be red.if the greatest number of beads that will fit on the braid is 12,what other fractions could represent the part of the beads that are red?