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VashaNatasha [74]
3 years ago
7

Step by step on how to solve this equation 2 x + 3 = x − 4 because I fogot how to do basic math

Mathematics
1 answer:
valentina_108 [34]3 years ago
4 0

Answer:

-7

Step-by-step explanation:

2x +3 =x-4

2x - x =-4 - 7

x=-7

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3 years ago
A box with a square base and open top must have a volume of 32,000 cm3. find the dimensions of the box that mini- mize the amoun
zmey [24]
Alrighty


squaer base so length=width, nice


v=lwh
but in this case, l=w, so replace l with w
V=w²h

and volume is 32000
32000=w²h


the amount of materials is the surface area
note that there is no top
so
SA=LW+2H(L+W)
L=W so
SA=W²+2H(2W)
SA=W²+4HW

alrighty

we gots
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we want to minimize the square foottage
get rid of one of the variables
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solve for H
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subsitute

SA=W²+4WH
SA=W²+4W(32000/W²)
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take derivitive to find the minimum
dSA/dW=2W-128000/W²
where does it equal 0?

0=2W-1280000/W²
128000/W²=2W
128000=2W³
64000=W³
40=W

so sub back
32000/W²=H
32000/(40)²=H
32000/(1600)=H
20=H

the box is 20cm height and the width and length are 40cm
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Answer:

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Step-by-step explanation:

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Step-by-step explanation:

6 0
3 years ago
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