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pshichka [43]
3 years ago
12

Please answer this!!!

Mathematics
2 answers:
strojnjashka [21]3 years ago
5 0

Answer:

12/13

Step-by-step explanation:

we know this is a right triangle, and we know that the hypotenuse is the longest side. so we can already say that the hypotenuse of the triangle is DF or 78.

when you draw it out, you find that the shortest leg is 30 and the second is 72 and the hypotenuse is 78. we also know that cosine is adjacent/hypotenuse. once you draw the triangle and notice which side is adjacent to angle F, just fit it into the formula and you get:

cos F = 72/78

cos F = 12/13

Goryan [66]3 years ago
4 0

Answer: Choice C. \frac{12}{13}

Step-by-step explanation:

  • It helps to draw a right triangle with hypotenuse DF=78, and adjacent EF=72.
  • Plug in cosine adjacent over hypotenuse and simplify.
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igor_vitrenko [27]

Answer:

58100

Step-by-step explanation:

The way I see it is move the decimal point over to the right (or left depending on whether its negative or not) however many units the exponent says. After it moves over the number, add the zeroes for the remaining amount of spaces until you have moved it over the correct amount. I'm not sure if that made any sense, but I know the answer is correct.

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3 years ago
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Suppose you have entered 79​-mile biathlon that consists of a run and a bicycle race. During your​ run, your average velocity is
kirza4 [7]

Answer:

The distance of the run is 10 miles

The distance of the bicycle race is 69 miles

Step-by-step explanation:

Let:

  • r = the distance for the run
  • 79 - r = the distance for the bicycle race
  • t = the time of the run
  • 5 - t = the time of the bicycle race

The run: r = 5t

The bicycle race: 79 - r = 23(5 - t)

Simplify the bicycle race:

  • 79 - r = 115 - 23t
  • -r = 36 - 23t
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Now we have two equations set up for r

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  • r = 23t - 36

We know that r = r, so 5t must equal 23t - 36

  • 5t = 23t - 36
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Now we know that the run took 2 hours.

Plug it back into the equation for the run to find the distance for the run

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To solve for the bicycle race, we simply subtract 10 from 79, because we know that the two distances combined are 79.

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The bicycle race is 69 miles.

-Chetan K

4 0
3 years ago
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Answer:

D because 15/12 and 5/4 are the same thing as they are simplified versions of each other.

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tatyana61 [14]

Answer:

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Step-by-step explanation:

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A = x^2

Take the square root of each side

sqrt(A) = sqrt(x^2)

x = sqrt(A)

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P = 4s since the picture is a square

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kramer

Answer:

Step-by-step explanation:

Hello,

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