Adult for every 6 children. one class has 24 children; one has 26 children; and the third has 28 children. each class has 1 teacher. how many other adults are needed for the trip?

10 adults

Step-by-step explanation:

1 adult per 6 children

there already 1 adult per class so 6 children from each class are covered

24 - 6 = 18

26 - 6 =20

28 - 6 = 22

18 + 20 + 22 =  60

60 ÷ 6 = 10

so 10 more adults are needed

10% of increase is the final answer! : )

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11