Answer:

Step-by-step explanation:
Answer:
±2√21.
Step-by-step explanation:
First, you break 84 down into √4⋅√21.
That is equal to ±2√21.
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Answer:
y = 2/3x - 1/2
Step-by-step explanation:
y = 2/3x - 1/2 is a linear function. It contains a slope and a y-intercept and every x value will produce a unique y value.
y = 4/x + 1 is a rational function, as it contains a fraction.