Simplify by combining like terms in each of the following expressions. 1. 1s2 + 10s2 - 21st =

2. 5st + - st - t2 =

3. x2+ x2 + x3=

4. 6 x - 4 x + 2=

5. 9x - 3s - 2t=

6. 87x + 8x - 1 =

7. 3x + 6x - 2 =

8. 8s - 4s + 3s =

9. 12 +1x - 11 x =

10. 12x + 24 x - 3 x - 4 =

11. 14t + 8t - 12t =

12. 17g + 14g - 6g +g =

13. 13 + 12 -12 + 13x =

14. 17s - 3s + 3s =

15. 14t - 12t + t =

Ihave this math question 2/3 ÷2 1/10=

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.

Which expressions are equivalent to -7+3(-4e-3)? choose all answers that apply: choose all answers that apply: a -4(3e+4)? 4(3e+4) b 12e12e c none of the above