B is the answer
hope it helped
Solve the rational equation by combining expressions and isolating the variable x.
x = 1/5
Hope this helps! :)
Although Alma did use a survey to ask her friends whether listening to music improves their test grades, she did not provide a sample nor could she experiment without using this variable. Thus, using the same reasoning, choices A, B, and C are excluded.
D) She did not use a random sample, and she tried to show cause and effect with an observational study.
Answer
<u>sometimes</u>
* entries are the amount of numbers in the matrices*
{ 6, 0, 9, 7}
would have 4 entries
2*3 and 2*3 both have the same number of entries but are not defined
and 2*3 and 3*2 both have the same number of entries and are defined
so it can't be always or never.
