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shepuryov [24]
3 years ago
12

There are 500 people in a building. 20% of half of them went out. 15% of those who went out came back in. How many people are in

the building now?
Mathematics
2 answers:
Setler79 [48]3 years ago
5 0

Answer:

415people

Step-by-step explanation:

20%of250=100people

15%of the 100people=15people

So 100 went out remaining(500-100)400

Then 15 returned=400+15

<u>4</u><u>1</u><u>5</u>

Vaselesa [24]3 years ago
4 0

Answer:

<em>458</em><em> people in the building now. </em>

Step-by-step explanation:

20%x500/2 = 20% x 250=50

15% x 50 = 7.5

7.5 + (500 - 50) =457.5 =458people.

Tell me if it's correct plz.

Hope this helps..

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Sedaia [141]

Answer:

An interesting experiment is given. We need to address various questions based on our knowledge of calculus.

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Part (a)

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Time taken for the radius to become 0 = t2 and the same can be obtained by solving:

r = 2 - √t2 = 0

Hence, t2 = 22 = 4 hours

Hence, the time duration of the entire experiment (from the introduction of the bacteria until its disappearance) = t1 + t2 = 4 + 4 = 8 hours

Step 3

Part (b)

r(t) = 0.5t for 0 ≤ t ≤ 4

and

r(t) = 2 - √(t - 4) for t > 2

Step-by-step explanation:

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3 years ago
40 plus what equals 180
Leno4ka [110]

Answer:

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6 0
2 years ago
Read 2 more answers
Suppose that the sum of the three vectors u, v, and w shown in the figure is the zero vector. If w = 10 find u and v.
tangare [24]

a. The value of v is 9.2

b. The value of u is 9.9

<h3>What are vectors?</h3>

Vectors are physical quantities that have both magnitude and direction

<h3>How to find the value of vectors u and v?</h3>

Since we have vectors

  • u at 70° to the x-axis
  • v at 47° to the x-axis and
  • w = 10 at 15° to the x-axis,

We resolve them into component form

So, u = -(ucos70°)i - (usin70°)j

u = -(0.3420u)i - (0.9397u)j

v = -(vcos47°)i + (vsin47°)j

v = -(0.6820v)i - (0.7314v)j

w = (wcos15°)i + (wsin15°)j

w = (0.9659w)i + (0.2588w)j

w = (9.659)i + (2.588)j

Since the sum of the three vectors is zero, we have that

u + v + w = 0

u + v = -w

So,

-(0.3420u)i - (0.9397u)j + [-(0.6820v)i - (0.7314v)j] = -[(9.659)i + (2.588)j]

-(0.3420u)i - (0.9397u)j -(0.6820v)i - (0.7314v)j = -(9.659)i - (2.588)j]

-(0.3420u)i -(0.6820v)i - (0.9397u)j - (0.7314v)j = -(9.659)i - (2.588)j]

-[0.3420u + 0.6820v]i - [0.9397u + 0.7314v]j = -(9.659)i - (2.588)j

Equating i components, we have

-[0.3420u + 0.6820v]i = -9.659i

0.3420u + 0.6820v = 9.659

Dividing through by 0.3420. we have

u + 1.994v = 28.242 (1) and

Also, equating j components, we have

- [0.9397u + 0.7314v]j = -2.588j

0.9397u + 0.7314v = 2.588  

Dividing through by 0.9397 we have

u + 0.778v = 2.754 (2)

<h3>a. The value of v</h3>

Subracring equation (2) from(1),we have

u + 1.994v = 28.242 (1)

-

u + 0.778v = 2.754 (2)

2.772v = 25.488

v = 25.488/2.772

v = 9.19

v ≅ 9.2

The value of v is 9.2

<h3>b. The value of u</h3>

Substituting v into (1), we have

u + 1.994v = 28.242 (1)

u + 1.994(9.19) = 28.242

u + 18.325 = 28.242

u = 28.242 - 18.325

u = 9.917

u ≅ 9.9

The value of u is 9.2

Learn more about vectors here:

brainly.com/question/25705666

#SPJ1

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ivann1987 [24]
N + 4 / 3    = 1 / 3

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∴

N + 4  = 1

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A sports writer makes his pre-season picks for the top ten team finish. If there are 40 teams, how many different lists could th
ziro4ka [17]

I think the answer is 30 because difference means subtract


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