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3 years ago

2|x-7|=x-8 pls help

Mathematics

1 answer:

Alenkinab [10]3 years ago

3 0

I believe the answer to this question is: No solution.

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to estimate the height of the jin mao tower in shanghai , a tourist sights the top of the tower form a mirror that is 86.7 meter

Ray Of Light [21]

Answer:

The height of the tower = 420.48 meters

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)

m∠B = m∠E = 90°

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

-2 + 11 + 16 + (-82) + 5 + (-11)

Tom [10]

Answer:

-63

Step-by-step explanation:

6 0

2 years ago

Read 2 more answers

Can someone please explain how to do c i thank you

maksim [4K]

i) first you combine the like terms; 3x² and x², then 4x and -8x, then -7n and -1.

Then you would get 4x²-4x-8.

You then cannot simplify further. so your answer would be 4x²-4x-8.

4 0

3 years ago

Read 2 more answers

what is the largest amount of postage in cents that cannot be made by using only 3 cent and 5 cent stamps?

NARA [144]

Answer: The largest you can't make is 7 cents.

Step-by-step explanation:

Once you get 3 consecutive amounts, you can get all larger ones just by adding 3 cent stamps. So let's see what you can make:

1 no

2 no

3 yes

4 no

5 yes

6 yes

7 no

8 yes, and this will give you 11 14 17 etc

9 yes, and this will give you 12 15 18 etc

10 yes, and this will give you 13 16 19 etc.

7 0

3 years ago

Read 2 more answers

Can u please help me this is hard

Westkost [7]

So we basically need to find 35% of 20. An easy way to find percents is to multiply by the decimal form of said percent. So, .35 x 20 = 7.

Brea will hit the ball approximately 7 times when she is at bat.

3 0

2 years ago