Answer:
2250 elementary educators have attended the conference before.
Explanation:
First figure out the number of female and male elementary educators there are.
Female elementary educators:
2/5=.4
.4x4500=1800
Male elementary educators:
2/5=.4
.4x3000=1200
Now add the total amount of elementary educators together.
1800+1200=3000
Now that you have your total amount of educators, figure out what 3/4 of the educators have attended before.
3/4=.75
.75x3000=2250
2250 is your answer.