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Vlad [161]
3 years ago
5

HURRY!! BRAINLIEST IF RIGHT!!​

Mathematics
1 answer:
Dvinal [7]3 years ago
6 0
I believe it’s be sorry if I’m wrong
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An airplane flew for 4 hours at a speed of a miles per hour (mph), and at (x + 10) mph for next 4 hours. What expression can be
Akimi4 [234]

Answer:

I think it would be C in my cass

Step-by-step explanation:

5 0
3 years ago
The rate of transmission in a telegraph cable is observed to be proportional to x2ln(1/x) where x is the ratio of the radius of
sergij07 [2.7K]

Answer:

The value of x that gives the maximum transmission is 1/√e ≅0.607

Step-by-step explanation:

Lets call f the rate function f. Note that f(x) = k * x^2ln(1/x), where k is a positive constant (this is because f is proportional to the other expression). In order to compute the maximum of f in (0,1), we derivate f, using the product rule.

f'(x) = k*((x^2)'*ln(1/x) + x^2*(ln(1/x)')) = k*(2x\,ln(1/x)+x^2*(\frac{1}{1/x}*(-\frac{1}{x^2})))\\= k * (2x \, ln(1/x)-x)

We need to equalize f' to 0

  • k*(2x ln(1/x) - x) = 0 -------- We send k dividing to the other side
  • 2x ln(1/x) - x = 0 -------- Now we take the x and move it to the other side
  • 2x ln(1/x) = x -- Now, we send 2x dividing (note that x>0, so we can divide)
  • ln(1/x) = x/2x = 1/2 -------  we send the natural logarithm as exp
  • 1/x = e^(1/2)
  • x = 1/e^(1/2) = 1/√e ≅ 0.607

Thus, the value of x that gives the maximum transmission is 1/√e.

7 0
4 years ago
A rectangular prism with length 12 m , width 8 m & height 15 m , find its surface area .
Irina-Kira [14]

Answer: 792\ m^2

Step-by-step explanation:

Given

The length of the rectangular prism is l=12\ m

width of the rectangular prism is w=8\ m

height of the rectangular prism is h=15\ m

The surface area of the rectangular prism is 2[wl+lh+hw]

Put the values

\Rightarrow 2[8\times 12+15\times 12+15\times 8]\\\Rightarrow 2[96+180+120]=2\times 396\\\Rightarrow 792\ m^2

The surface area of the rectangular prism is 792\ m^2

7 0
3 years ago
What is the sum of the lengths of the shortest and longest ski trails? pls help with number 5
d1i1m1o1n [39]

Answer:

ummmmm whats the ski trails leaghts i dont have enough info

Step-by-step explanation:

7 0
2 years ago
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Three decided by 2 equals
Nonamiya [84]

Answer:

1.5 is the answer when 3 is divided by 2

Step-by-step explanation:

<h3>   </h3>
4 0
3 years ago
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