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3 years ago

Im giving 30 points pls help

Mathematics

2 answers:

gayaneshka [121]3 years ago

7 0

Step-by-step explanation:

Pathagory and Theorem

a^2+b^2=c^2

(x-3)^2+(x-4)^2=6^2

expand:

2x^2-14x+25=36

2x^2-14x-11=0

x=(\sqrt{71}+7)/2

perimeter=(x-3)+(x-4)+6=2x-1

insert the value for x into 2x-1

$\sqrt{71}$ +6=perimeter

Hope that helps :)

m_a_m_a [10]3 years ago

4 0

9514 1404 393

Answer:

2x -1

Step-by-step explanation:

The perimeter is the sum of the side lengths.

P = 6 + (x -4) + (x -3)

P = 2x -1 . . . . . . collect terms

The perimeter is 2x -1.

_____

<em>Additional comment</em>

There is nothing in the problem statement that suggests this is a right triangle. Without knowing at least one angle, we cannot solve for a numerical value for the perimeter. The problem title suggests we're to leave the result in polynomial form.

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Step-by-step explanation:

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2 years ago

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tekilochka [14]

Answer:

It will take 5.61 seconds for the coin to reach the stream.

Step-by-step explanation:

The height of the coin, after t seconds, is given by the following equation:

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The stream is the ground level.

So the coin reaches the stream when h(t) = 0.

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Multiplying by (-1)

$16t^{2} - 72t - 100 = 0$

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

$ax^{2} + bx + c, a\neq0$ .

This polynomial has roots $x_{1}, x_{2}$ such that $ax^{2} + bx + c = a(x - x_{1})*(x - x_{2})$ , given by the following formulas:

$x_{1} = \frac{-b + \sqrt{\bigtriangleup}}{2*a}$

$x_{2} = \frac{-b - \sqrt{\bigtriangleup}}{2*a}$

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In this question:

$16t^{2} - 72t - 100 = 0$

$a = 16, b = -72, c = -100$

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$t_{2} = \frac{-(-72) - \sqrt{11584}}{2*16} = -1.11$

Time is a positive measure, so we take the positive value.

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