Answer: GCF of 54 and 45: 9.
Step-by-step explanation: The factors of 54 include: 1, 2, 3, 6, 9, 18, 27, and 54. The factors of 45 include: 1, 3, 5, 9, 15, and 45. The largest common factor of 45 and 54 is 9.
Using proportions, it is found that it will take them 0.00248548 minutes to do one loop.
<h3>What is a proportion?</h3>
A proportion is a fraction of a total amount, and the measures are related using a rule of three.
In this problem, according to their speed, in 60 minutes, they drive 300 miles. In how many minutes will they drive 20 m = 0,0124274 miles?
The <em>rule of three</em> is:
60 min - 300 miles
x min - 0.0124274 miles
Applying cross multiplication:
![300x = 60 \times 0.0124274](https://tex.z-dn.net/?f=300x%20%3D%2060%20%5Ctimes%200.0124274)
![x = \frac{60 \times 0.0124274}{300}](https://tex.z-dn.net/?f=x%20%3D%20%5Cfrac%7B60%20%5Ctimes%200.0124274%7D%7B300%7D)
![x = 0.00248548](https://tex.z-dn.net/?f=x%20%3D%200.00248548)
It will take them 0.00248548 minutes to do one loop.
More can be learned about proportions at brainly.com/question/24372153
Answer:
17. C 60°
18. D 121°
Step-by-step explanation:
The external angle is half the difference of the intercepted arcs.
17. (161° -41°)/2 = 60°
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18. (? -59°)/2 = 31°
? = 59° +2(31°) = 121°