Which statements are true? All landforms have the same combinations of elevation and relief.
Different landforms have different combinations of elevation and relief.
Elevation is the height of a feature above sea level.
Relief is the height of a feature below sea level.
Relief is the difference between the highest and lowest points in an area.

0.66y = 0.9x + 0.48 if y has a value of 108.45 what is the value of x?

1) in saturated limewater, [h+ ]=3.98x10-13 m. a) find [oh]-/ b) what is the ph? / c) is the solution acidic, basic, or neutral? / 2) in butter, [h+ ]=6.0x10-7 m. a) find [oh]-/ b) what is the ph? / c) is the solution acidic, basic, or neutral? / 3) in peaches, [oh]=3.16x10-11 m a) find [h+ ]/ b) what is the ph? / c) is the solution acidic, basic, or neutral? / 4) during the course of the day, human saliva varies between being acidic and basic. if [oh]=3.16x10-8 m, a) find [h+ ]/ b) what is the ph? / c) is the solution acidic, basic, or neutral? /

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.