PLEASE HELP ME IM TRYING SO HARD MY TEACHER DIDNT EXPLAIN AND ITS DUE IN A COUPLE HOURS. Just please tell me those answers.

4. 3/8

5. 1/20

6. 1/18

7. 2/5

8. -2/3

9. -1/14

10. 1 3/4

11. -2

12. 17 1/3

13. 10 5/6

14. 5/6

15. 6

16. 4 1/8

17. 1 7/8

18. 12

Here are your answers! I am sorry that your teacher didn't explain this math to you. Anyway, I hope you have a good day.

21.4 i did it already for s1

step-by-step explanation:

let's call the solutions x₁ = (5 - 2√7)/3 and x₂ = (5 + 2√7)/3

then the equation is (x-x₁)(x-x₂) = 0

if you fill that in you get a lot of numbers which you can recognize as ax²+bx+c=0.

step-by-step explanation:

you can see that a=1 (there is just an x²)

b = (-5 -2√7 + 2√7 - 5)/3 = -10/3

c = -2√7)/3 ) * (-5+2√7)/3) = -1/3

so your answer is 3x^2 – 10x – 1 = 0