The best definition for the term substitution would be...
the action of replacing someone or something with another person or thing.
Both are not earning different salaries.
If a study determines the difference in average salary for subpopulations of mechanical engineers and civil engineers is NOT significant, then the subpopulations of mechanical and civil engineers are not earning different salaries.
Study determines that there is not any significant study so thats why both are not earning.
Learn more about average median on:
brainly.com/question/14532771
#SPJ10
Answer: supplementary, complementary, linear pair
Step-by-step explanation:
D. 989 sq.m should be the right answer