Does the equation below represent a relation, a function, both a relation and a function, or neither a relation nor a function?
y = x2 - 9x
a
a
function only
function only
b.
neither a relation nor a function
c.
relation only
d.
both a relation and a function
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D. Both a relation and a function.

Step-by-step explanation:

We have been given an equation . We are asked to determine whether the equation represent a relation, a function, both a relation and a function, or neither a relation nor a function.

We know that the relationship between x and y-values of an ordered pair is know as relation. The set of all values is known as domain of relation and set of all y-values is known as range of relation.

We also know that a relationship will be also a function, when each input in the domain has exactly one specific corresponding output.  

We know that equation is an upward opening parabola. If we draw a vertical line on parabola, it never intersects the graph of parabola twice, therefore, our given function is a relation and function.

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.

62.5 paisa

step-by-step explanation:

4000*70 = 280000

280000-(2000*90) = 100000

4000-2400 = 1600

100000/1600 = 62.5

( give brainliest)