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3 years ago

Please no links I’ll pick brainliest Which one is incorrect

Mathematics

1 answer:

madam [21]3 years ago

3 0

Answer:

the graph because it should go down every 10 minutes not up.

Step-by-step explanation:

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A jewel box is to be constructed of materials that costs K1 per square inch for the bottom, K2 per square inch for the sides, an

slava [35]

Answer:

x= 5,77 *∛ K₂ / ( K₁ + K₅ ) the side f the square bottom-top

h = 2,88/ [∛ K₂ / ( K₁ + K₅ ) ]² heigh of the box

Step-by-step explanation:

Data from problem statement only gives one relation between dimensions of the box, we need two, in order to express surface area as a function of just one variable. In such a case we must assume the box is of square bottom and top.

Then

Area of the bottom A(b) = x² ⇒ C(b) = K₁*x²

Area of the top A(t) = x² ⇒ C(t) = K₅*x²

Total lateral area ( 4 sides) A(l) = 4*x*h ⇒ C(l) = 4*K₂*x*h

V(bx) = 96 in³

V(bx) = x²*h = 96

h = 96/x²

Then total cost as a function of x

C(x) = K₁*x² + K₅*x² + 4*K₂*(96)/x

Taking derivatives on both sides of the equation

C´(x) = 2*K₁*x + 2*K₅*x - 384*K₂/x²

C´(x) = 0 ⇒ 2*K₁*x + 2*K₅*x - 384*K₂/x² = 0

2*K₁*x³ + 2*K₅*x³ = 384*K₂ or K₁*x³ + k₅*x³ = 192*K₂

x³ ( K₁ + K₅ ) = 192*K₂

x = ∛192*K₂ / ( K₁ + K₅ )

x= 5,77 *∛ K₂ / ( K₁ + K₅ )

If we obtain the second derivative

C´´(x) = 2*K₁ + 2*K₅ - (-2*x)*384*K₂/x⁴

C´´(x) = 2*K₁ + 2*K₅ + 768*K₂/x³

As x can not be negative the expression C´´ wil be C´´> 0

then we have a minimum for the function for x = 5,77 *∛ K₂ / ( K₁ + K₅ )

and h = 96 / [ 5,77 *∛ K₂ / ( K₁ + K₅ )]²

h = 2,88/ [∛ K₂ / ( K₁ + K₅ ) ]²

6 0

4 years ago

Solve the system, enter as an ordered triple. Need HELP!!

just olya [345]

<h3>Answer: (2, 3, 1)</h3>

This means x = 2, y = 3 and z = 1

========================================================

Work Shown:

Double everything in the second equation to get 4x-2y+4z=6

Add this result to the first equation

$x+2y-4z = 4\\4x-2y+4z = 6\\5x+0y+0z = 10$

The first two lines of that expression above shows us adding x+2y-4z=4 to the equation 4x-2y+4z = 6

The x terms add to x+4x = 5x

The y terms add to 2y+(-2y) = 0y

The z terms add to -4z+4z = 0z

The terms on the right hand side add to 4+6 = 10

That's how we end up with the new equation 5x+0y+0z = 10

That becomes 5x = 10 which solves to x = 2 when we divide both sides by 5.

------------------------

Use this x value in the third original equation to find z

3x-8z = -2

3(2)-8z = -2

6-8z = -2

-8z = -2-6

-8z = -8

z = -8/(-8)

z = 1

------------------------

Use the x and z values we found to find y

x+2y-4z = 4

2+2y-4(1) = 4

2+2y-4 = 4

2y-2 = 4

2y = 4+2

2y = 6

y = 6/2

y = 3

----------------------

Overall we get the solutions to be x = 2, y = 3 and z = 1

We can say the solution as an ordered triple is (x,y,z) = (2,3,1)

8 0

3 years ago

In a school 50% of learner's are younger than 10 , 1/20 are 10years old and 1/10 are older than 10 but younger than 12, the rema

frosja888 [35]

Answer:

1/20=10 years old

In a school 50% of the students are younger than 10, 1/20 are 10 years old and 1/10 are older than 10 but younger than 12, the remaining 70 students are 12 years or older. How many students are 10 years old?

50%= younger than 10

1/20=10 years old

1/10=older than 10 younger than 12

70=12 years or older

50%- 10/20

1/20-1/20

1/10-2/20

10/20+1/20+2/20=13/20

70 students =7/20

1/20 = 10 years old.

7/20 divided by 7 = 1/20

70 divided by 7=10

10 students are 10 years old

4 0

2 years ago

Read 2 more answers

If a recipe call for 2 gallons of strawberries, how many pounds should you use if there are 7 oz per cup?

Valentin [98]

Answer:

20-25

Step-by-step explanation:

i think but not sure

8 0

3 years ago

I need some help please

Alenkasestr [34]

Answer:

Step-by-step explanation:

8 0

3 years ago