It is not a function—an element from the domain is paired with more than one element from the range. Specifically, the input value of 4 corresponds to two output values: 5 and -4.
A function can only take on one output for each input. It only takes one input value to associate with more than one output value to be invalid as a function.
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Step-by-step explanation:
Simple
We will subtract
21 - 16 = 5
So 5 more students can join the class
First reduce it.
10:7 In a sense that is about as far down as you can go
You could however make it 1 3/7 to 1
