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lukranit [14]
3 years ago
12

In a lake, one-fourth of the water is replaced by clean water every year. Sixteen thousand cubic meters of soluble toxic chemica

l spill takes place in the lake.
How much toxic will be left after 12 years?
When will 80% of the toxin be eliminated?
Mathematics
1 answer:
hodyreva [135]3 years ago
4 0

Answer:

7 sorry if I’m wrong

Step-by-step explanation:

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1) Suppose a rhombus has 12 cm sides and a 30° angle. Find the distance between the pair of opposite sides.
Sergeeva-Olga [200]

Answer:

1) 6 cm

2) 117°

Step-by-step explanation:

1) Draw a picture of the rhombus.  The distance between opposite sides is the height of the rhombus.  If we draw the height at the vertex, we get a right triangle.  Using trigonometry:

sin 30° = h / 12

h = 12 sin 30°

h = 6 cm

2) Draw a picture of the rectangle.

∠KML is the angle the diagonal makes with the shorter side ML.  This angle is 54°.  ∠NKM is the angle the diagonal makes with the shorter side NK.  ∠KML and ∠NKM are alternate interior angles, so m∠NKM = 54°.

The angle bisector of angle ∠NKM divides the angle into two equal parts and intersects the longer side NM at point P.  So m∠PKM = 27°.

KLMN is a rectangle, so it has right angles.  That means ∠KML and ∠KMN are complementary.  So m∠KMN = 36°.

We now know the measures of two angles of triangle KPM.  Since angles of a triangle add up to 180°, we can find the measure of the third angle:

m∠KPM + 36° + 27° = 180°

m∠KPM = 117°

7 0
3 years ago
BRAINLEST: Without shipping costs, a textbook costs $11.17 from a particular online
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Step-by-step explanation:

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2 years ago
Divide the following polynomial using synthetic division, then place the answer in the proper location on the grid. Write answer
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Answer:

5.338401847392900e1395%377846Q9

Step-by-step explanation:

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I think it’s -36, not 100% sure though
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