Answer: C
Step-by-step explanation: Hope this help :D
Hi there!

The following trapezoidal theorem states that:
Middle segment = average of top and bottom side
Thus:
M = 1/2(b1 + b2)
21 - x = 1/2(17 + 11)
Solve:
21 - x = 1/2(28)
21 - x = 14
Subtract 21 from both sides:
-x = 14 - 21
-x = -7
Multiply both sides by -1:
x = 7
1 mile has 3 markers.
2 miles have 6 markers.
2/3= 2 markers.
2 2/3 has 11 markers placed on the trail! 6+3+2=11
Hope this helps!
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At that rate, cyclists will cover a distance of 57 meters in 3 seconds.
The ratio of two related quantities expressed in several units is known as a rate.
Speed is the ratio of the distance traveled in a period of time. Speed is given by:
Speed = distance/time
The cyclist's speed, given that he completes 380 meters in 20 seconds, will be:
Speed = distance/time
s = d/t
v = 380 m / 20 s
v = 19 m/s
If he travels at this rate, at 3 seconds, the distance is:
Speed = distance/time
Distance = Speed × time
d = s × t
d = 19 m/s × 3 s
d = 57 m
Therefore,
At that rate, the cyclist will travel a total distance of 57 meters in 3 seconds.
Learn more about rate here:
brainly.com/question/119866
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8/(1/6) = (8/1)/(1/6) = (8/1) * (6/1) = 48/1 = 48
Patel found the quotient incorrectly since he got 1/48.
To check the division, he needed to multiply 48 by 1/6 and get 8.
Instead, he multiplied 1/48 by 6, so the multiplication done as a check is also incorrect.
Answer: last choice