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muminat
3 years ago
7

What expression can be used for estimating 868 divided by 28

Mathematics
2 answers:
weeeeeb [17]3 years ago
6 0
868 is about 870, and 28 is about 30, so your expression would be 870 divided by 30 which would be 29 and the actual answer is 31, so your estimate would be close to your actual answer.
DochEvi [55]3 years ago
5 0
You could do 870/30=29.
<span>Or you could do 868/28=31 </span>and then round it<span> but it looks like it doesn't need rounding.</span>
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solniwko [45]

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3 years ago
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8 0
2 years ago
Find the length of the line PA.
Diano4ka-milaya [45]

RO divides the rectangle into two congruent right triangles.

The area of the one triangle is equal half area of the rectangle.

Calculate the area of rectangle:

A_R=lw\\l=12,\ w=5\\\\A_R=12\cdot5=60

The area of right triangle:

A_T=\dfrac{1}{2}A_R\to A_T=\dfrac{1}{2}\cdot60=30

Use the Pythagorean theorem to calculate the length of RO:

|RO|^2=5^2+12^2\\\\|RO|^2=25+144\\\\|RO|^2=169\to|RO|=\sqrt{169}\to|RO|=13

The formula of an area of this right triangle is:

A_T=\dfrac{1}{2}|RO||PA|

Therefore we have the equation:

\dfrac{1}{2}(13)|PA|=30\qquad|\cdot2\\\\13|PA|=60\quad|:13\\\\|PA|=\dfrac{60}{13}\\\\|PA|\approx4.62

8 0
3 years ago
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gavmur [86]

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5 0
2 years ago
2.5y=5 what is the answer to the equation?
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Answer:2

Step-by-step explanation:

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=5

7 0
2 years ago
Read 2 more answers
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