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krek1111 [17]
3 years ago
9

A rectangular box has a square base with an edge length of x cm and a height of h cm. The volume of the box is given by V = x^2h

cm^3. Find the rate at which the volume of the box is changing when the edge length of the base is 4 cm, the edge length of the base is increasing at a rate of 2 cm/min, the height of the box is 15 cm, and the height is decreasing at a rate of 3 cm/min.
The volume of the box is decreasing at a rate of 192 cm^3/min.
The volume of the box is increasing at a rate of 288 cm^3/min.
The volume of the box is decreasing at a rate of 288 cm^3/min.
The volume of the box is increasing at a rate of 192 cm^3/min.
Mathematics
1 answer:
tiny-mole [99]3 years ago
3 0
Option 4 is correct i.e. <span>The volume of the box is increasing at a rate of 192 cm^3/min.

</span>Given : Volume of the rectangular box  = x²h 
where x is edge and h is height.
The edge and the height are varying with time, therefore, we write,x = x(t)
h = h(t)
dh/dt = -3 and we shall calculate when x = 4, dx/dt = 2 and when h=15 
V = x²h dV/dt = (2x × dx/dt × h) + (x² × dh/dt) dV/dt = 2×4×2×15 + (4)^2 ×(-3) dV/dt = 240 - 48
dV/dt = 192 
Because dV/dt is positive, hence the volume is increasing  
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Solution:

1) Use letters to identify the variables:

Number of trumpets: t
Number of clarinets: c

2) Translate each statement into algebraic (mathematical) language.

2.1) Sold a total of 27 used trumpets and clarinets

=> t + c = 27

2.2) Trumpets cost $149 and clarinets cost $99

Total cost of the trumpets: 149t
Total cost of clarinets: 99c

Total cost = 149t + 99c

2.3) Total sales were $3223

=> 149t + 99c = 3223.

3) State the system of equations:

Equation (1) t + c = 27
Equation (2) 149t + 99c = 3223

4) Solve the system of equations:

4.1) Multiply equation 1 by 149:

=> 149t + 149c = 4023

4.2) Subtract the equation (2) from the equation obtained in 4.1

=> 149c - 99c = 4023 - 3223

=> 50c = 800

=> c = 800 / 50 = 16

5) Verify the solution:

From equation (1) t = 27 - 16 = 11

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Step-by-step explanation:

To find the solutions of the quadratic equation given in the problem, you can apply the proccedure shown below:

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Therefore, by applyin the steps above, you obtain:

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I hope this helps :)
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