Ineed with this algebra 1 study guide. it has 5 questions . this has many hard questions so to you people that like a challenge, can you me out?

1. Rational numbers can be written as a ratio (fraction)
Whole numbers are rational. 5 = 5/1, for example.
Square roots are NOT rational.  Example: √3
However, square roots of square numbers can be simplified, and are therefore rational. √4 = 2, rational.

√4 + √16 = 2 + 4 = 6. rational
√5 + √36... irrational
√9 + √24... irrational
2 × √4 = 2 × 2 = 4. rational
√49 × √81 = 7 × 9 = 63. rational
3√12... irrational

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A, since neither 3 nor 12 is a square but we end up with 6.

The answer is 225 miles per 4.5 hours. hope this ; )