The Map of a biking trail is drawn on a coordinate grid
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Let's make a proportion:
Cross multiply
45 × 6 = 270
Divide by 30
270 ÷ 30 = 9
Let's make a proportion:
Cross multiply
45 × 6 = 270
Divide by 30
270 ÷ 30 = 9
Choice D will create an irrational number when added. This is because a rational number plus a rational number will always be irrational (you can experiment this by trying to add rational numbers to pi). For example, 3 + pi = 6.1415926..... or 
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