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10 questions from this quiz
Different xxx-values give different yyy-values
No, both x=1x=1x=1 and x=3x=3x=3 map to y=4y=4y=4
Yes, each xxx maps to a unique yyy
If a function is one-to-one
No, a horizontal line crosses it twice
Yes, horizontal lines cross it once only
[52,∞)[\frac{5}{2}, \infty)[25,∞)
R∖{52}\mathbb{R} \setminus \{\frac{5}{2}\}R∖{25}
Expression under root must be ≥0\geq 0≥0
Denominator cannot equal zero
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