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Tom [10]
3 years ago
11

I need help with this.

Mathematics
1 answer:
Sloan [31]3 years ago
4 0

9514 1404 393

Answer:

  61.4

Step-by-step explanation:

The length of two semicircles of diameter 10 is the circumference of a circle of that diameter:

  C = πd = 10π ≈ 31.4

The perimeter includes that length plus the lengths of two straight sides that are 15 units each.

  P = 31.4 + 2×15

  P = 61.4 . . . . units

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What the vaule of x in the equation 3x-4y=65, when y =4
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Step-by-step explanation:

3x-4(4)=65

3x-16=65

3x=65+16

3x=81

3x/3=81/3

X=27



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I WANT SOLUTION AND EXPLANATION ANSWER IS GIVEN AT LAST!!!
Pavel [41]
<h3><u>Question:</u></h3>

The present ages of Ram and Rehman are in the ratio 8:9. After 5 years, the ratio of their ages will be 9:10. Find their present ages.

<h3><u>Statement:</u></h3>

The present ages of Ram and Rehman are in the ratio 8:9. After 5 years, the ratio of their ages will be 9:10.

<h3><u>Solution:</u></h3>
  • Let the present age of Ram and Rehman be 8x years and 9x years respectively.
  • After 5 years, their ages will be 9x years and 10 years respectively.
  • Therefore, by the problem

\frac{8x + 5}{9x + 5}  =  \frac{9}{10}  \\  =  > 10(8x + 5) = 9(9x + 5) \\  =  > 80x + 50 = 81x + 45 \\  =  > 50 - 45 = 81x - 80x \\  =  > x = 5

  • So, the present age of Ram = 8x years = (8×5) years = 40 years
  • The present age of Rehman = 9x years = (9×5) years = 45 years
<h3><u>Answer:</u></h3>

The present ages of Ram and Rehman are 40 years and 45 years respectively.

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Step-by-step explanation:

I think 4f + 10

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