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Vaselesa [24]
4 years ago
7

an engineer is surveying a building with a device that is 6 feet above the ground. he is 60 feet from the building and is lookin

g with an angle of elevation of 45°. how tall is the building? ... i'm really bad at trig. x....x
Mathematics
1 answer:
REY [17]4 years ago
8 0
The entire system forms a right angle triangle.
Let the height of the bulding be x, then tan 45 = (x - 6)/60
60 = x - 6
x = 60 + 6 = 66

Therefore the height of the building is 66 feet.
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Help me to do this please
Tanzania [10]

If x represents the mass of 1 ball in kg, then the balance shows ...

... 6x = x + 9 kg

... 5x = 9 kg

Then 6x is ...

... (6/5)·5x = (6/5)·9 kg = 10.8 kg

0.8 kg = 0.8·1000 g = 800 g

so 10.8 kg is ...

... D. 10 kg 800 g

7 0
3 years ago
Select a counter-example that makes the conclusion false.
Softa [21]
A counter-example could be

There are more than 3 marbles in the bag, and the other ones are red.

Hope this helps!
4 0
3 years ago
Find the area of a square whose side is 4xy.​
ruslelena [56]

Step-by-step explanation:

Given,

Side of a square = 4xy

Therefore, area of the square = side × side

= 4xy × 4xy

16 {x}^{2}  {y}^{2} (ans)

6 0
3 years ago
Read 2 more answers
The officers of a high school senior class are planning to rent buses and vans for a class trip. Each bus can transport 6363 ​st
attashe74 [19]

Answer:

  • 1 bus, 72 vans
  • $6960 is the minimum cost

Step-by-step explanation:

A bus costs over $19 per student; a van costs less than $12 per student. The required number of students could be transported by 81 vans, but that requires 81 chaperones.

Since there are only 80, and a bus requires fewer chaperones per student, we can reduce the number of required chaperones to an acceptable level by employing one bus. 1 bus replaces 9 vans, and requires 1 less chaperone than 9 vans.

The minimum cost is 1 bus and 72 vans. That cost is $1200 +72×$80 = $6960.

3 0
3 years ago
Cube A has a volume of 9 in3. Cube B has a volume of 5 in3. Which of the following expresses the ratio of the side length of Cub
Troyanec [42]

Using the formula for the volume of a cube, it is found that the expression which gives the ratio of the side length of Cube A to the side length of Cube B is:

r = \frac{3^{\frac{2}{3}}}{5^{\frac{1}{3}}}

Which means that option E is correct.

The <em>volume of a cube</em> of side length l is given by:

V = l^3

For Cube A, the volume is of 9 cubic inches, hence:

l_a^3 = 9

l_a = \sqrt[3]{9}

l_a = 9^{\frac{1}{3}}

l_a = 3^{\frac{2}{3}}

For Cube B, the volume is of 5 cubic inches, hence:

l_b^3 = 5

l_b = \sqrt[3]{5}

l_b = 5^{\frac{1}{3}}

Then, the ratio is:

r = \frac{l_a}{l_b} = \frac{3^{\frac{2}{3}}}{5^{\frac{1}{3}}}

To learn more about the volume of a cube, you can take a look at brainly.com/question/13030328

5 0
3 years ago
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