3 years ago

Greg drew a pair of parallel lines and a line segment next to each other on a chalkboard.

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7 0

Greg drew a pair of parallel lines and a line segment next to each other on a chalkboard. The statement that <span>best compares the pair of parallel lines and the line segment is D. </span><span>The parallel lines extend infinitely in both directions, and the line segment has two endpoints.</span>

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64 A fisherman traveled in a boat from point N upstream. After having traveled 6 km, he stopped rowing and 2 hour 40 min after f

Leviafan [203]

Let c represent the speed of the current.

time = distance / speed

total time = time going upriver + time going downriver
2 2/3 = 6/(9 -c) + 6/c
(8/3)(c)(9 -c) = 6c +6(9 -c)
(8/3)c^2 -24c +54 = 0
c = (24 ± √((-24)^2 -4(8/3)(54)))/(2*8/3)
.. = (3/16)(24)
c = 4.5

The speed of the river's current is 4.5 km/h.