3 years ago

The grade of a road is 7 percent. what angle does the road make with the horizontal

Mathematics

1 answer:

Svetllana [295]3 years ago

7 0

It goes up or down for every 7 units..... slope angle

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Solution:

$\sqrt{4x + 13} = x + 2$

First square both sides.

$= > ( \sqrt{4x + 13} ) ^{2} = (x + 2) ^{2}$

Now, square root and square gets cancel out in the LHS. And in the RHS, apply the identity: (a + b)² = a² + 2ab + b².

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Now, transpose 4x and 4 to LHS.

$= > 4x - 4x + 13 - 4 = {x}^{2} \\$

Now, do the addition and subtraction.

$= > {x}^{2} = 9 \\ = > x = \sqrt{9} \\ = > x = ±3$

Answer:

x = ± 3

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<h2>have a great day! I hope this helps! </h2>

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