Why are tertiary sources, such as websites and magazines, usually considered less dependable than primary or secondary sources of scientific information? o o tertiary sources have not been fact-checked by reviewers, so the information in tertiary sources is never reliable. tertiary sources provide information based solely on opinion, rather than scientific fact tertiary sources are not usually authored by scientists and therefore do not provide reliable information tertiary sources usually do not cite information from primary sources, and may perpetuate errors made by secondary sources

Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].

Iwould say d. eye contact and body language because you aren’t using any spoken communication. hope this : )

Answer feldspar,quartz,mica and amphibole;

Joe ran 130 yards because 3 feet make 1 yard so using this ratio 390 feet make 130 yards.