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harkovskaia [24]
3 years ago
8

Explain how you can use estimation to check that your answer is reasonable

Mathematics
1 answer:
serg [7]3 years ago
7 0
Make sure the estimates are accurate to check that try using the rounding song (if it's 4 or below leave it alone,if it's 5 or higher give it a shove)
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Help me please i will give brainliest :)
s2008m [1.1K]

Answer:

y = x - 10

Step-by-step explanation:

3 0
2 years ago
a rectangular block is such that the sides of its base are of the length x cm and 3x cm. The sum of all the lengths of all its e
Xelga [282]

Answer:

15x^2 - 12x^3

Step-by-step explanation:

A rectangular block has 3 parts that play into its volume.  length, width and height.  The question gives us length and width in the form of x and 3x, so height is what's missing.

It gives us a bit more information saying the sum of its edges is 20.  We also have to ask how many lengths, widths and heights are there.  That may be a bit hard to understand, but  is you are looking at a block I could ask how many edges are vertical, just going up and down.  These would be the heights.  There are 4 total, and this goes the same for length and width, so 4*length + 4*width and 4*height = 20.  

Taking that and plugging in x for length and 3x for width (or you could do it the other way around, it doesn't matter, you get:

4*x + 4*3x + 4*height = 20

4x + 12x + 4h = 20

16x + 4h = 20

4h = 20 - 16x

h = 5 - 4x

Now we have h in terms of x, which lets us easily find the volume just knowing x.  To find the volume of a rectangular block you just multiply the length, width and height.

x*3x*(5-4x)

3x^2(5-4x)

15x^2 - 12x^3

Question doesn't give a specific value for x at all so you should be done there.  Any number you plug in for x should get you the right answer

5 0
2 years ago
(a)Find the greatest common factor (GCF) of 72 and 40.<br> (b)Use the GCF to factor 72 - 40.
DiKsa [7]

Answer:

(72-40) = 8 x (9-5)

Step-by-step explanation:

GCF = 8

(72-40) = 8 x (9-5)

4 0
2 years ago
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What is the domain
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<h3>Answer: Give the domain and the range of each quadratic function whose graph is described. The vertex is (−1,−2)(−1,−2) and the parabola opens up.</h3>

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During the month of febuary fabulous feet shoe mart sold 48 pairs of red loafers. After an ad campaign to boost sales they sold
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The percent of increase in sales.
(60-48)/48)*100=25%
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2 years ago
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