Aprincipal needs 2 chaperones for every 25 students at the school dance how many chaperones does he need if 225 students are expected to be at the dance

How to use order of operation in 20 divide by 4 multiply 5 = 1

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )

Can someone explain to me how to do