The answer is b or the second choice available
Answer: 9 boys and 12 girls
Step-by-step explanation:
21 * 3/7 = 9
21 * 4/7 = 12
So first of all on the graphs the top right and middle right is the positives, bottom left and middle left is the negatives.
Row 1 is negative
Row 2 is undefined
Row 3 is undefined
And Row 4 is positive.
Hope it helped!