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3 years ago

Help please! will give high points and brainliest

Mathematics

1 answer:

Sophie [7]3 years ago

4 0

Answer:

its gonna be 4 -4 becue its half of thbe original anwser

Step-by-step explanation:

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A trigonometry student stands 25 meters from a building and measures the angle of elevation to the top of the building as 30â°.

kozerog [31]

Using the slope concept, it is found that the angle measurement has to be within 1.2º of 30º.

<h3>What is a slope?</h3>

The slope is given by the <u>vertical change divided by the horizontal change</u>, and it's also the tangent of the angle of depression.

In this problem, considering the horizontal distance and the actual angle, the following equation is applied to find the actual height:

$\tan{30^\circ} = \frac{h}{25}$

$h = 25\tan{30^\circ}$

h = 14.43.

For an error of 5%, the bounds of h are as follows:

$h_{min} = 0.95 \times 14.43 = 13.71$

$h_{max} = 1.05 \times 14.43 = 15.15$

Hence, the angles will be given by:

$\tan^{\alpha} = \frac{13.71}{25}$

$\alpha = \tan^{-1}{\left(\frac{13.71}{25}\right)}$

$\alpha = 28.8$

$\tan^{\alpha} = \frac{15.15}{25}$

$\alpha = \tan^{-1}{\left(\frac{15.15}{25}\right)}$

$\alpha = 31.2$

Hence the angle measurement has to be within 1.2º of 30º.

More can be learned about the slope concept at brainly.com/question/18090623

5 0

2 years ago

Write 10x² + 3x -2=-1 in the form a(x+h)²+k clearly stating

Fofino [41]

Answer:

Below in bold.

Step-by-step explanation:

10x² + 3x -2 = -1

10x^2 + 3x - 1 = 0 Taking 10 out from the first 2 terms:-

10(x^2 + 0.3) - 1 = 0 Completing the square:

10[(x + 0.15)^2 - 0.15^2] - 1 = 0

10[(x + 0.15)^2 - 0.0225] - 1 = 0

10(x + 0.15)^2 - 0.225 - 1 = 0

10(x + 0.15)^2 - 1.225 = 0 is vertex form.

The vertex (turning point is at (-0.15, -1.225).

y- intercept is at the point where x = 0,

- that is at y = 10(0.15)^2 - 1.225 = -1

So at (0, -1).

Solving for x:

10(x + 0.15)^2 - 1.225 = 0

(x + 0.15)^2 = 0.1225

x + 0.15 = +/- sqrt 0.1225

x = -0.15 +/- sqrt 0.1225

The roots are -0.5, 0.2

7 0

3 years ago

A total of 622 tickets were sold for the school play. They were either adult tickets or student tickets. There were 72 more stud

Amiraneli [1.4K]

Answer:

257

Step-by-step explanation:

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3 years ago

What is a three digit number for 100,10,1

Ne4ueva [31]

Answer:

111

hope that helps!

3 0

3 years ago

There are 32 patients in a waiting room, and 8 of them are children. What is the child to adult ratio (expressed in the lowest t

jeyben [28]

Answer:

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3 years ago