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madam [21]
3 years ago
10

-1•f(-9)+7•g(6)= A.32 B.34 C.36 D.38

Mathematics
1 answer:
pishuonlain [190]3 years ago
4 0

Answer:

38

Step-by-step explanation:

-1•f(-9)+7•g(6)

f(-9) is 4

g(6) = 6

-1* 4+7*6

-4 +42

38

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Answer:

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Step-by-step explanation:

For better understanding of the solution, see the figure attached below :

Let the height of the tower be x meters

Now, using the laws of reflection : angle of reflection = angle of incidence

Also, both the tower and the tourist are standing parallel to each other

⇒ ∠A = ∠i ( Alternate interior angles are equal)

Similarly, ∠D = ∠r ( Alternate interior angles)

But, ∠i = ∠r

⇒ ∠A = ∠D

Also, the tourist and the tower is perpendicular to the ground surface.

⇒ m∠B = m∠E = 90°

Now, in ΔABC and ΔDEC

∠A = ∠D (Proved above)

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So, by AA postulate of similarity of triangles, ΔABC ~ ΔDEC

As the sides of similar triangles are proportional to each other

\frac{AB}{DE}=\frac{BC}{EC}\\\\\implies\frac{1.92}{x}=\frac{0.4}{87.6}\\\\\implies x=\frac{87.6\times 1.92}{0.4}\\\\\bf\implies x = 420.48\textbf{ meters}

Hence, The height of the tower = 420.48 meters

5 0
3 years ago
Please help!!! the question is in the picture above— this is geometry
Serga [27]

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Evgen [1.6K]

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Step-by-step explanation:

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DedPeter [7]
So

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B. $1029
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