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ZanzabumX [31]
3 years ago
10

HELP PLZ ILL GIVE U BRAINS :)

Mathematics
2 answers:
shutvik [7]3 years ago
7 0

Answer:

brains...yum

Answer: 5x - 9 = 6

Step-by-step explanation:

x = 3

2(3) - 8 -= 5 --> 6 - 8 =5  (false)

9(3) + 4 = -31 --> 27 + 4 = -31 (false)

6(3) - 9 = 57 --> 18 - 9 = 57 (false)

5(3) - 9 = 6 --> 15 - 9 = 6 (true)

Paladinen [302]3 years ago
7 0

Answer:

5x-9 =  6

Step-by-step explanation:

5x−9=6

Add 9 to both sides.

5x=6+9

Add 6 and 9 to get 15.

5x=15

Divide both sides by 5.

x=  15/5

Divide 15 by 5 to get 3.

x=3

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we must do the following:

0

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8 0
1 year ago
A closed box with a square base is to have a volume of 13 comma 500 cm cubed. The material for the top and bottom of the box cos
andrezito [222]

Answer:

x  =  1,5 cm

h  =  6  cm

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Step-by-step explanation:

Volume of the box is :

V(b)  = 13,5 cm³

Aea of the top is equal to area of the base,

Let call  " x " side of the base then as it is square area is A₁ = x²

Sides areas are 4 each one equal to x * h  (where h is the high of the box)

And volume of the box is   13,5 cm³  = x²*h

Then   h  =  13,5/x²

Side area is :  A₂ =  x* 13,5/x²

A(b)  = A₁  + A₂

Total area of the box as functon of x is:

A(x)  = 2*x²  + 4* 13,5 / x

And finally cost of the box is

C(x)  = 10*2*x²   +  2.50*4*13.5/x

C(x)  = 20*x²  +  135/x

Taking derivatives on both sides of the equation:

C´(x)  =  40*x   -  135*/x²

C´(x)  = 0     ⇒      40*x   -  135*/x² = 0    ⇒  40*x³ = 135

x³  = 3.375

x  = 1,5 cm

And   h  =  13,5/x²     ⇒   h  =  13,5/ (1,5)²

h = 6 cm

C(min)  = 20*x²  + 135/x

C(min)  = 45  +  90

C(min)  = 135 $

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