In how many different ways can 4 of 15 laboratory assistant be chosen to assist with an experiment?? Step by step answer plz

Can someone tell me if this is perpendicular? !

This graph shows which inequality? a ≤ –3 a > –3 a ≥ –3 a < –3

The table shows the number of hours orlando spent at football practice last week. select the appropriate numbers below to complete the model to find the number of hours orlando spent practicing on tuesday and friday.