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Sidana [21]
3 years ago
11

How do I work this out

Mathematics
1 answer:
gregori [183]3 years ago
4 0
P = a + b + c where a < b < c

P = 42 in
b = 18 in
a = x
c = 4x - 1

The equation:

x + 18 + 4x - 1 = 42    |combine items

5x + 17 = 42      |subtract 17 from both sides

5x = 25    |divide both sides by 5

x = 5 (in)

c = 4 · 5 - 1 = 20 - 1 = 19 (in)

Answer: The length of the longest side is 19 in.
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Alona [7]

The speed of current will be "4.5 mph" and the rate Pratap can row in still water will be "8.5 mph".

What does "speed" mean in mathematics?

  • Speed is what it means. the speed of a change in an object's location in any direction.
  • Speed is defined as the ratio of distance to the amount of time it took to cover that distance.
  • Speed is a scalar quantity because it just has a direction and no magnitude.

Given:

Distance "26 miles" in time "2 hours".

Let,

Speed of water = y

Pratap speed when rowing in still water = x

As we know,

      Speed = distance/time

then,

  x + y = 26/2

  x + y = 13

 x = 13 - y

In return trip took him time "6.5 hours",

       x - y = 26/6.5

      x - y = 4

By substituting the value of "x", we get

 13 - y - y = 4

  13 - 2y = 4

     2y = 13 - 4

        2y = 9

          y = 9/4 = 4.5 mph (Rate of the current)

By substituting the value of "y", we get

    x = 13 - a

   x = 13 - 4. 5 = 8.5 mph (Pratap can row in still water)

Learn more about speed

brainly.com/question/28224010

#SPJ13

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