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Alenkasestr [34]
3 years ago
13

The percentage of water in an unknown hydrate was determined by heating the sample and driving the water off the sample. Two ind

ependent measurements gave values of 19.564% and 21.731%. Its percentage should be reported as:
Mathematics
1 answer:
Bas_tet [7]3 years ago
8 0

Answer:

It should be reported as 20.648%

Step-by-step explanation:

Since we have 2 different observed values hence we shall use an average of the 2 values to report the result

Thus value is \frac{19.564+21.731}{2}=20.6475%

As we can see that the least count of our observations is upto 3 decimal places hence we have to report a result upto only 3 decimal places thus we need to round off the fourth decimal place thus the digit shall be increased by 1 since we have to drop off 5 and the digit before 5 is 7 which is an odd number.

Thus the result shall be 20.648%

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When writing fraction from a graph does the x axis number go on top or bottom​
Harlamova29_29 [7]

Answer:

x ax-s can be horizontal and top

y axis is bottom

Step-by-step explanation:

8 0
3 years ago
A dime has a radius of 8 1/2 millimeters. Find the circumference of a dime to the nearest tenth.
masya89 [10]
Dear Ffw299, we can find the circumference of a dime using the formula C=2πr. 2x3.14x8.5=59.5 millimeters in circumference.
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3 years ago
Area of square = 9 mm2<br> Perimeter of square=
GalinKa [24]

Answer:

the perimeter of the square is 12 mm

Step-by-step explanation:

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8 0
3 years ago
Read 2 more answers
A submarine was traveling along the surface of the ocean and decides to dive. If the dive angle is 28° with the horizontal surfa
Alex_Xolod [135]

Answer:

1.5 nautical miles

Step-by-step explanation:

See the attached diagram.

The submarine starts to dive at point A and diving along AB.

If the distance traveled underwater i.e. AB = 1.7 Nautical miles and C is the point directly above its current position at B.

Then Δ ABC is a right triangle having ∠ BAC = 28° {Given}

So, using trigonometry we can write  

\cos 28 = \frac{AC}{AB} = \frac{AC}{1.7}

⇒ AC = 1.7 \times \cos 28 = 1.5 nautical miles.

Therefore, the surface distance that the submarine travels is 1.5 nautical miles. (Answer)

3 0
3 years ago
A watermelon seed is 0.4cm long. How far would a line of 124 watermelon seeds stretch? Write your answer in meters.
Ahat [919]
Distance stretched  = 0.4 *  124  =  49.6 cms

converting to meters we divide by 100:-

Answer is 0.496 meters
6 0
3 years ago
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