D Elion and her colleagues were responsible for developing important drugs
Answer:

Step-by-step explanation:
the other 3 are perfect squares and have rational answers.

Joyce waited 50 minutes waiting for the train
Step-by-step explanation:
divide 60 by 3 cause 3 quarters of an hour is 3/4 then you wanna take half an hour and add that (30 mins) getting 50 minutes
i have no ideaaaaa HAHAHAHA
Answer:
6
Step-by-step explanation:
1/3 x 4 = 1.333....
1.333.... x 9 = 12
12 x 1/2 = 6