An 8th grade English teacher is interested in grammar scores for students coming from the two 7th grade English teachers. Scores from Teacher A 85 90 75 70 95 80 85 85 80 85 Scores from Teacher B 70 80 75 70 75 70 80 80 90 100 Is there a meaningful difference in the means for student scores on a pretest coming from each 7th grade teacher based on the samples? (If needed, round to the nearest hundredth) Teacher A: mean = MAD = Teacher B: mean = MAD = The difference in means is and is MAD's apart. As a result, I know there (is or is not) a meaningful difference.

phosphate, calcium ion, chloride ion, neon atom

step-by-step explanation:

1. 8

2. 9

3. 20

4. 3

5. 17

6. 2.2

7. 11.25

8. 1

9. 14

10. 2

step-by-step explanation:

thats the first half

when rotating a figure 180 degrees, imagine that you are able to take the figure and turn it clockwise or counterclockwise around a center point. to rotate a figure 180 degrees, you will need to apply the rule (x, y) → (-x, -y). start by using a coordinate grid with coordinates for each vertex of the figure. the center point of the coordinate grid is located at (0, 0), which is what you will rotate the figure around. write down the original coordinates of the shape you are going to rotate. then, apply the rule. for example, coordinate (1, 2) becomes (-1, -2). another example would be, coordinate (-4, -2) becoming (4, 2). after you change each original coordinate to the rotated coordinate, you will draw your new figure.

step-by-step explanation: