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tamaranim1 [39]
2 years ago
6

BRAINLIST WILL BE GIVEN TO THE PERSON WHO GIVES THE CORRECT ANSWER​

Mathematics
2 answers:
hjlf2 years ago
6 0

Answer:

25pi. 36pi

10pi. 12pi

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

9pi. 49pi

6pi. 14pi

melomori [17]2 years ago
6 0

Step-by-step explanation:

Area (A) = πr²

Circumference (C) = 2πr

<u>Blue Circle</u>:

A = (5)²π

A = 25π

C = 2(5)π

C = 10π

<u>Pink Circle</u>:

A = (6)²π

A = 36π

C = 2(6)π

C = 12π

<u>White Circle</u>:

r = 3

A = (3)²π

A = 9π

C = 2(3)π

C = 6π

<u>Red Circle</u>:

A = (7)²π

A = 49π

C = 2(7)π

C = 14π

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Answer: First train speed shall be 42 mi/hr

Second train speed shall be 84 mi/hr

Yes it is the valid answer, it gets annoying when almost everyone enters the wrong answer for a good laugh. Either way, hope this helps! Have a spectacular day.

Step-by-step explanation:

What is the 1st train's head start in miles?

Let +s+ = the speed of the 1st train in mi/hr

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+d%5B1%5D+=+s%2A2+

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

Let +d+ = distance the 2nd train travels until

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From 4PM to 6PM is 2 hrs

Start time when the 2nd train leaves

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

Equation for 1st train:

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Equation for 2nd train:

(2) +d+=+%28+s%2B42+%29%2A2+

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

Substitute (2) into (1)

(1) +%28+s%2B42+%29%2A2+-+2s+=+s%2A2+

(1) +2s+%2B+84+-+2s+=+2s+

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+s%2B+42+=+42+%2B+42+

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

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

check:

(2) +d+=+%28+s%2B42+%29%2A2+

(2) +d+=84%2A2+

(2) +d+=+168+

and

(1) +d+-+2s+=+s%2A2+

(1) +d+-+2%2A42+=+42%2A2+

(1) +d+=+84+%2B+84+

(1) +d+=+168+

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