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3 years ago

Helppp...........................math

Mathematics

1 answer:

elena55 [62]3 years ago

6 0

Answer is 3x/2
Step by step exploration
90 min=1.5 h= 3/2 h

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A rectangular tank that is 2048 ft cubed with a square base and open top is to be constructed of sheet steel of a given thicknes

lyudmila [28]

Answer:

Step-by-step explanation:

Let the total surface area of the rectangular tank be S = 2LW+2LH+2WH where;

L is the length of the box

W is the width of the box

H is the height of the box.

Since the box is openend at the top, S = lw + 2lh+ 2wh

If the base is a square base then, l = w

S = l(l) + 2wh+2wh

S = l²+4wh ............... 1

If volume = lwh

lwh = 2028 ft³

wh = 2048/l ................ 2

Substitute equation 2 into 1;

S = l²+4(2048/l)

S = l²+8192/l

dS/dl = 2l - 8192/l²

If dS/dl = 0 (since we are looking for dimensions of the tank with minimum weight.)

2l - 8192/l² = 0

2l = 8192/l²

2l³ = 8192

l³ = 8192/2

l³ = 4096

l =∛4096

l = 16 ft

Since the length is equal to the width, hence the width = 16ft (square based tank)

Given the volume V = lwh = 2048

lwh = 2048

16*16*h = 2048

256h = 2048

divide both sides by 256

256h/256 = 2048/256

h = 8ft

<em>Hence, the dimensions of the tank with minimum weight is 16ft by 16ft by 8ft.</em>

4 0

3 years ago

The local store where Tim shops charges a 7% sales tax for clothing. Complete the table by figuring the cost of the jeans after

Sindrei [870]

Answer:

$A=P+P\times S\%$

Step-by-step explanation:

For calculating the sales tax of a product, it is required to first multiply the original cost price of the product by the sales tax percentage.

Once the sales tax has been computed add it to the original cost price in order to determine the total cost of the product.

The formula of final amount is:

$A=P+P\times S\%$

Here,

A = final amount

P = original cost price

S = sales tax percentage

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3 years ago

I can travel 612 miles in 1 hour in my super speedy plane. Assume that there are 5,280 ft per mile. How many get would I travel

mixas84 [53]

Answer:

3231360

Step-by-step explanation:

5280 x 612 equals 3231360

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3 years ago

Is the Answer A,B,C, or D?

Yuliya22 [10]

The answer is C. 4/5 I already gave you a explanation on why in your last question

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3 years ago

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I will give you a Brainly crown if it is right. Will you help me

Feliz [49]

Answer:

Step-by-step explanation:

if the top half is 180° and one side is 95° then the other side is 85°

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3 years ago

Helppp...........................math ​

Helppp...........................math