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GLASGOWANASTASIA
17.10.2019 •
Mathematics
Craig ran the first part of a race with an average speed of 8 miles per hour and biked the second part of a race with an average speed of 20 miles per hour. the entire two-part, 15-mile race took him 1.125 hours to complete. which table correctly represents his rates, times, and distances for each part of the race?
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Ответ:
x/8 + (15 - x)/20 = 1.125
5x + 2(15 - x) = 40 x 1.125
5x + 30 - 2x = 45
3x = 45 - 30 = 15
x = 15/3 = 5
Therefore, the distance of the first part of the race is 5 miles and the time is 5/8 = 0.625 hours or 37.5 minutes
The distance of the second part of the race is 15 - 5 = 10 miles and the time is 1.125 - 0.625 = 0.5 hours or 30 minutes.
Ответ:
area of circle
A = 3.14 x 7^2
A = 153.86 cm^2
area of rectangle:
A = 3 x 9 = 27 cm^2
Area of shaded:
153.86 - 27 = 126.86 = 126.9 cm^2
Answer is D. 126.9 cm^2