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Usimov [2.4K]
3 years ago
8

I need answers to these questions would appreciate it

Mathematics
1 answer:
yanalaym [24]3 years ago
7 0

Answer:

the first one is 1.935843 x 10^6

the second one is 4 x 10^7

subtract the two numbers in each question

convert to scientific notation:

if the number is 40,000,000 the scientific notation would be 4 x 10^7 because there are 7 spaces behind the first digit, or the 4

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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
Please help :) worth more than 10 points :) Find the area of the triangle.
olga_2 [115]

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5 0
3 years ago
Find the perimeter of the rectangle on the centimeter grid​
Tatiana [17]

Answer:

24 centimeters

Step-by-step explanation:

You can just count the squares around the rectangle since each of those squares is a centimeter. Hence the name centimeter grid.

3 0
3 years ago
If (X + 8) is a factor of f(x), which of the following must be true?
julsineya [31]

Answer: C

Step-by-step explanation:

If (X + 8) is a factor of f(x), then to find the root, equate the factor to zero. That is,

X + 8 = 0

X = 0 - 8

X = -8

If -8 is substituted into f(x), the equation will tend to zero. That is,

F( -8 ) = 0

C is therefore the correct answer.

4 0
3 years ago
Find the height of a rectangular prism if the area of its base is 240 square inches and its volume is 2880 cubic inches.
worty [1.4K]

Answer:

Step-by-step explanation:

area of base = 240 in²

volume = (area of base)× height

2880 in³ = 240 in² × height

height = 2880/240 = 12 in

3 0
3 years ago
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