Aschool assembly had 30 students in attendance, and 20% of them were first-graders. how
many first-graders were at the assembly?

6

Step-by-step explanation:

If a school assembly had 30 students in attendance, and 20% of them were first-graders, there were 6 first-graders at the assembly.

20% of 30 = 6

a) justify

step-by-step explanation:

justifying is just part of everyday life. justify kind of means proof so i think the answer is a) justify.