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vladimir2022 [97]

3 years ago

11

Can someone please explain this to me?

1 answer:

gladu [14]3 years ago

8 0

the circumference is the perimeter of a circle or ellipse. That is, the circumference would be the arc length of the circle.

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1. A study of college freshmen found that students who watched TV for more than one hour each night gained 15 pounds in the firs

umka21 [38]

Answer:

C. They most likely used an observational study asking students to keep track of their TV habits and weight.

A. This is an experiment because a treatment was applied to a group.

Step-by-step explanation:

According to our question:

1. The study concluded that there is a relation between watching TV and the weight gain in college freshmen.

Now, this is possible when a group of college students were asked to participate to watch TV for more than 1 hour for a specific amount of time and have a record of their weights.

So, the study is an observational study where the habits and weights of college students were observed.

Hence, option C is correct.

2. The students were divided onto two groups where one group used the computer program and the other did not to check the improvement in the reading levels.

This means that the students were given a procedure to follow during the study in order to see the results..

So, the study is an experiment where a treatment is applied to the group of students.

Hence, option A is correct.

8 0

3 years ago

Read 2 more answers

Can anyone help me I was self isolating when my class was taught this and I can't get in contact with my teacher

Aleonysh [2.5K]

Answer:

Step-by-step explanation:

3x +2y = 13 -----------------(i)

x + 2y = 7 ----------------(ii)

Multiply the equation (ii) by (-1) and then add.

(i) 3x + 2y = 13

(ii)*(-1) <u>-x - 2y = -7 </u> {Now, add and y will be eliminated}

2x = 6

x = 6/2

x = 3

Plug in x = 3 in equation (i)

3*3 + 2y = 13

9 + 2y = 13

2y= 13 - 9

2y = 4

y = 4/2

y = 2

5 0

3 years ago

Read 2 more answers

The population of deer forest is currently 800 individuals. Scientists predict that this population will grow at a rate of 20 pe

jonny [76]

Answer:

<em>C. 3.8 years</em>

Step-by-step explanation:

<u>Exponential Growth </u>

The natural growth of some magnitudes can be modeled by the equation:

$P(t)=P_o(1+r)^t$

Where P is the actual amount of the magnitude, Po is its initial amount, r is the growth rate and t is the time.

The actual population of deer in a forest is Po=800 individuals. It's been predicted the population will grow at a rate of 20% per year (r=0.2).

We have enough information to write the exponential model:

$P(t)=800(1+0.2)^t$

$P(t)=800(1.2)^t$

It's required to find the number of years required for the population of deers to double, that is, P = 2*Po = 1600. We need to solve for t:

$800(1.2)^t=1600$

Dividing by 800:

$(1.2)^t=1600/800=2$

Taking logarithms:

$t\log 1.2=\log 2$

Dividing by log 1.2:

$t=\frac{\log 2}{ \log 1.2}$

Calculating:

t = 3.8 years

Answer: C. 3.8 years

6 0

3 years ago

Antonio is buying a stereo, speakers, and amplifiers for his car audio system. He is choosing among 4 models of

Greeley [361]

Answer:

3 kinds of amplifiers

Step-by-step explanation:

4 0

4 years ago

Read 3 more answers

What is a third-degree binomial?

ankoles [38]

Answer:

B and D

Step-by-step explanation:

<em>Binomial = 2 terms in the expression</em>
<em>Third degree = highest added degree of variables in one term</em>

(A) It has 3 terms and highest degree of 4. It is trinomial of degree 4.

No

(B) It has 2 terms and highest degree of 3. It is binomial of degree 3.

Yes

(C) It has 2 terms and highest degree of 7. It is binomial of degree 7.

No

(D) It has 2 terms and highest degree of 3. It is binomial of degree 3.

Yes

8 0

3 years ago