Chemists define the acidity or alkalinity of a substance according to the formula
pH = -log(H), where H is the hydrogen ion concentration, measured in moles per liter.
Solutions with a pH value of less than 7 are acidic; solutions with a pH value of greater than
7 are basic; solutions with a pH of 7 (such as pure water) are neutral.

7. 153.86 ft

8. 12.56 ft

9. 78.5 m

10. 379.94 in

11. 132.665 m

12. 12.56 yd

13. 226.865 ft

14. 113.04 ft

15. 63.585 ft

16. 254.34 m

17. 50.24 cm

step-by-step explanation:

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20

step-by-step explanation:

2/3

step-by-step explanation:

the slope of a line is equal to the rise/run. in this case the line rises 2 units for every +3 units it moves