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adelina 88 [10]
3 years ago
12

2/5 times ( -10)=? ?=

Mathematics
2 answers:
Rudiy273 years ago
6 0

\frac{2}{5}  \times ( - 10)

2 \times  - 2

- 4

vovikov84 [41]3 years ago
6 0

Answer: -4

<u>Multiply Numerator by Numerator</u>

2*(-10)=-20

<u>Multiply Denominator by Denominator</u>

5*1=5

Your answer: -20/5

<u>Divide</u>

-20÷5=-4

Final Answer: -4

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<span>l = length

w = width

h = height


SA = 2lw + 2wh + 2lh.


V = lwh.


Write an expression for the ratio of surface area to volume:


SA / V = [</span><span><span> 2lw + 2wh + 2lh] / </span>lwh 

SA / V = 2lw / lwh + 2wh / lwh + 2lh / lwh

SA / V = 2/h + 2/l + 2/w



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I will work with an hypothetical figure where you have , l, w and the volume.


I suppose you know the volume, because it is the amount of product you need to pack. Make V = 1000 cm^3, l = 10 cm and w = 5 cm.

Wtih two dimensions and the volumen you can find the other dimension.


V = lwh = 1000 cm^3 => h = 1000 cm^3 / (lw) = 1000 cm^3 / (10 cm * 5 cm)


h = 1000 cm^3 / (50 cm^2) = 20 cm


Now you have the three dimensions to pack 1000 cm^3 of your product:

l = 10 cm
w = 5 cm
h = 20 cm


And the ratio of surface area to volume is:

SA / V = 2/h + 2/l + 2/w = 2/(20cm) + 2/(10cm) + 2/(5cm) = 0,7 (cm)^-1
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