This graph is an example of A. a linear function
B. a nonlinear function
C. neither a linear nor nonlinear function - it is not a function at all

$4

step-by-step explanation:

$30×5=$150

$150 minus $130=$20

$20÷5=$4.

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answer: 4  

the square root of 16 is 4. it is a very simple mathematic concept. a square root when a number multiplied by itself will result in a number. here, the number 16 comes when 4 is multiplied by 4. hence the square root of 16 is 4. you can always figure out a square root by the inverse operation of squaring.