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2 years ago

5

There were 80 runners to start a race in the first half of the race, 1/5 of them dropped out. In the second half of the race, 1/

4 of the remaining runners dropped out. How many runners finished the race

1 answer:

charle [14.2K]2 years ago

8 0

Answer:

4

Step-by-step explanation:

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kolbaska11 [484]

Answer:

∠CBD = 125°

Step-by-step explanation:

The angle sum theorem tells you that ...

∠ABC +∠CBD = ∠ABD

8x -41° +9x +17° = 180° . . . . . . a "straight angle" has a measure of 180°

17x -24° = 180° . . . simpify

17x = 204° . . . . . . add 24°

x = 12° . . . . . . . . . . divide by 17

Now the measures of the angles can be found from their expressions.

∠ABC = 8(12) -41° = 55°

∠CBD = 9(12) +17° = 125°

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