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Alenkasestr [34]
3 years ago
11

I don’t understand it so can someone help me I’ll give you 10 points for this or you get some points for that so please help me

on this thank youu.

Mathematics
1 answer:
juin [17]3 years ago
7 0

Answer:

C

Step-by-step explanation:

If you divide 36 by -12 you get -3

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A rectangular box with a square base and a cover is to be built to contain 640 cubic feet. If the cost per square foot for the b
mixer [17]

Answer:

  $4800

Step-by-step explanation:

The cost is minimized when any pair of opposite faces of the box costs the same as any other pair. Since the top+bottom total $25 per square foot and the sides (left+right or front+back) total $20 per square foot, the area of a side must be 25/20 = 5/4 times the area of the top or bottom.

If we let x represent the length of one side of the square bottom, then 5/4x will be the height of the box. Its volume will be ...

  (5/4x)(x²) = 640 ft³

  x³ = (4/5)(640 ft³) = 512 ft³ . . . . . . multiply by 4/5

  x = 8 ft . . . . . . . . . . . . . . . . . . . . . . . take the cube root

The base area is then (8 ft)² = 64 ft², and the cost of the top+bottom is ...

  64 ft² × $25/ft² = $1600

The three pairs of opposite sides will cost 3×$1600 = $4800.

The minimum cost of the constructed box is $4800.

_____

You can also write an equation for the total cost in terms of x, the side length of the base. That cost function will be ...

  c(x) = 15x² + 10x² + 10·4x(640/x²)

This simplifies to ...

  c(x) = 25x² +25600/x

A graph shows the minimum is c(8) = 4800 (as above).

__

Algebraically, you can set the derivative to zero to find the value of x.

  dc/dx = 0 = 50x -25600/x²

  512 = x³ . . . . multiply by x²/50 and add 512

  8 = x . . . . . . . take the square root. Same solution as above. <em>Cost is minimized when the side length of the base is 8 ft</em>.

8 0
3 years ago
PLSS HELP IVE BEEN STUCK FOR A WHILE! 12P! BRAINLIEST IF CORRECT!
algol13

Answer:

129 :)

Step-by-step explanation:


5 0
3 years ago
Two more than a number ​
schepotkina [342]
X+2 Hope this helps!
6 0
2 years ago
Read 2 more answers
How do I solve part A
timurjin [86]
You have to put them into order, then multiple the two sides kf the triangle then put them together
6 0
2 years ago
Read 2 more answers
Helpppppppppppppppppppppppppppppp
n200080 [17]
For this case we first write the equation of which we will use:
 I (db) = 10log (l / l)
 We substitute the value of l.
 We have then:
 l = 10 ^ 8lo
 Substituting in the given equation:
 I (db) = 10log ((10 ^ 8lo) / lo)
 Rewriting:
 I (db) = 10 * log (10 ^ 8)
 I (db) = 80
 Answer:
 I (db) = 80
 option 4
4 0
3 years ago
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