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Mekhanik [1.2K]
3 years ago
10

Busco nv de 13 años ​

Mathematics
2 answers:
MrMuchimi3 years ago
6 0

Answer:

Step-by-step explanation:

Huy

Arisa [49]3 years ago
5 0

Answer:

You are on the wrong website.

Step-by-step explanation:

Hablo Espanol

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There are 84 boys in the 6th grade class. If boys make up 30% of the 6th graders, how many students are in this whole 6th grade
koban [17]
<h3>Answer:  280</h3>

Work Shown:

x = number of students in the 6th grade class

30% = 30/100 = 0.30

30% of x = 0.30x this is equal to 84 since "30% of the 6th graders are boys (and there are 84 boys in sixth grade)", so we say 0.30x = 84

Divide both sides by 0.30 to isolate x

0.30x = 84

0.30x/0.30 = 84/0.30

x = 280

So there are 280 students overall in the 6th grade class.

7 0
4 years ago
Read 2 more answers
A environmental initiative has the goal of saving at least 25 2525 million hectares of rainforest through both planting trees an
Anestetic [448]

Answer:

The possible way for the initiative to accomplish its goal without exceeding its budget is use 12.5 hectares for planting trees and 12.5 hectares by purchasing land.

Step-by-step explanation:

Let the variable <em>X</em> represent the amount of land used for planting trees and <em>Y</em> represent the amount of land purchased.

The goal of the environmental initiative is to save at least 25 million hectares of rain forest.

That is:

<em>X</em> + <em>Y</em> = 25....(i)

Now it is provided that:

  • The cost of planting trees is $ 400 per hectare.
  • The cost of purchasing land is $ 260 per hectare.
  • The initiative has a budget of $8,250 million.

Using the above data it can be said that:

400<em>X</em> + 260<em>Y</em> = 8250....(ii)

Solve equations (i) and (ii) simultaneously.

\ \ \ \ x+y=25]\times 260\\400x+260y=8250\\\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\\\\\Rightarrow\\\\260x+260y=6500\\400x+260y=8250\\(-)\_\_\_\_\_\ (-)\_\_\_\_(-)\_\_\_\\\\\Rightarrow\\\\-140x=-1750\\\\x=\frac{1750}{140}\\\\x=12.5

Then the value of <em>y</em> is:

x+y=25\\y=25-x\\y=25-12.5\\y=12.5

Thus, the possible way for the initiative to accomplish its goal without exceeding its budget is use 12.5 hectares for planting trees and 12.5 hectares for purchasing land.

4 0
3 years ago
Use the chart to estimate the population density of Romania in 1997. Round to the nearest person.
STALIN [3.7K]

The population density of Romania in 1997 given its area and the population is 95 people per square km.

<h3>What is the population density?</h3>

Population density is the number of people that live in a square kilometer of an area. It is determined by dividing total population by total area.

Population density = population / area

22.600,000 / 237301 = 95 people per square km

To learn more about population density, please check:

brainly.com/question/3704320

#SPJ1

5 0
2 years ago
Simplify the expression 3(x+1)−2(3x+7)<br><br> A −3x−11<br> B−3x−10<br> C−3x−8<br> D−3x+17
mixas84 [53]

Answer: A: -3x-11

Step-by-step explanation:

Factor: 3x +3 - 6x - 14 (negative of the second distribution).

Combine terms with x: 3x - 6x = -3x

Combine terms that don't have x: 3 - 14 = -11

Combine both: -3x - 11

6 0
2 years ago
Read 2 more answers
Suppose that fund-raisers at a university call recent graduates to request donations for campus outreach programs. They report t
Flura [38]

Answer:

Following are the solution to the given points:

Step-by-step explanation:

In point a:

It's also expected that approximately 1000 \times  0.40 =400 of both, the students contribute zero, approximately 1000 \times 0.30 =300 to donors $10, approximately 1000 \times  0.25 = 250 donors $25, and then about 1000 \times 0.05 = 500 dollars $50 donors. Its frequencies would be similar to and not precisely, the probability. The four levels will stack up to a thousand.

In point b:

It is the population, in which the key value of x is a $0 donation ( 40 percent of students do this).

In point c:

\to P(X \geq 25) \\\\\to 0.25+0.05 \\\\\to  0.30

In point d:

\to P(X>0)\\\\ \to 1-P(X=0)\\\\ \to 1- 0.40\\\\\to 0.60\\\\

5 0
3 years ago
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