Answer:
The answer is "
"
Explanation:

In equation (a) multiply by 2 then subtract from the equation (b):

put the value of x in equation (a):

Answer:
What are the options?
The answer can be Kingdom, Phylum, or Class. (If it's multiple choice). But if it's a free response question, then put them all.
Explanation:
The order of classification:
Kingdom
Phylum
Class
Order
Family
Genus
Species
Species is the most specific classification and Kingdom is the least specific. Therefore, if 2 organisms are in the same species, they are also in the same Kingdom, Phylum, Class, Order, Family, and Genus. The same concept applies for Order. If two species are in the same order, then they are automatically in the same Kingdom, Phylum, and Class.
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Blood urea nitrogen (BUN) and creatinine tests can be used together to find the BUN-to-creatinine ratio (BUN:creatinine). A BUN-to-creatinine ratio can help your doctor check for problems, such as dehydration, that may cause abnormal BUN and creatinine levels.