21 students because if 6 represents 30% u add 6 two more time which equals 18 and 90% then u add 3 more because it is half of 6. when u add 3 more u will get 21 and 100%
Are there any answer choices maybe??
Answer:
b.)x+4
Step-by-step explanation:
-3+4=1
-2+4=2
-1+4=3
0+4=4
Answer is D if you subtract the two numbers
