1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
spin [16.1K]
3 years ago
15

The population of a town was 9000 people (in year "0"). The population began to decrease by 3% per year. State the number of WHO

LE years it would take for the population to fall below 4000 people.
Mathematics
1 answer:
kotykmax [81]3 years ago
3 0

Answer:model y = 720,500(1.022)^ , where x is the number of years ... starting value growth ratio b) What would the population be in 2000 if the growth continues at the same ... 3) A population of beetles is growing each month at a rate of 5%.

You might be interested in
Micah places a mirror on the ground 24 feet from the base of a tree. He walks
irina [24]

The height of tree is 8 feet

<h3><u>Solution:</u></h3>

Given, Micah places a mirror on the ground 24 feet from the base of a tree

At that point, Micah's eyes are 6 feet above the ground  

And he is 9 feet from the image in the mirror.  

To find : height of tree = ?

Let "n" be the height of tree

From the question, we can see there is a directly proportional relationship between heights and distances.

Proportional relationships are relationships between two variables where their ratios are equivalent.

\frac{\text { height of micah eyes above ground }}{\text { distance of micah from mirror }}=\frac{\text { height of tree above the ground }}{\text { distance of tree from mirror }}

\begin{array}{l}{\frac{6 \text { feet }}{9 \text { feet }}=\frac{n \text { feet }}{24 \text { feet }}} \\\\ {\frac{6}{9}=\frac{n}{24}} \\\\ {\text { n }=\frac{1}{3} \times 24} \\\\ {\text { n }=8}\end{array}

Hence, the height of the tree is 8 feet

6 0
3 years ago
The dimensions of a rectangle porch are 16 feet long 12 feet wide. Use the scale of 1 inch=4 feet and a ruler to make a scale dr
Mnenie [13.5K]

Answer:

4 inch long and 3 inch wide

Step-by-step explanation:

so since the scale factor is 1 inch = 4 feet and the actual length is 16 feet by 12 feet all you got to do is divide both lengths by 4 and you get 4 and 3 and you convert the unit to inches so it would be 4 inches and 3 inches. now all you got to do is draw a 4 inch long by 3 inch wide rectangle and your good

3 0
3 years ago
Read 2 more answers
An experiment was conducted to compare the use of iPads versus regular textbooks in teaching algebra to two classes of middle sc
lakkis [162]

Answer:

Step-by-step explanation:

Hello!

The objective is to determine if there is any difference between using iPads vs textbooks in teaching algebra.

Two middle school classes were selected, to eliminate any other source of variation, the same teacher taught both classes, and the materials were provided by the same author and publisher. After a month 10 students of each class were randomly selected and tested, their test scores were recorded:

X₁: test scores of students that used iPads to study.

n₁= 10

X[bar]₁= 86.8

S₁= 8.97

X₂: test scores of students that used regular textbooks to study.

n₂= 10

X[bar]₂= 79.5

S₂= 10.8

a.

H₀: μ₁=μ₂

H₁: μ₁≠μ₂

α:0.05

Assuming that both variables are normally distributed and the population variances are equal, the statistic to use is a Student t for two independent samples with pooled sample variance:

t_{H_0}= \frac{(X[bar]_1-X[bar]_2)-(Mu_1-Mu_2)}{Sa*\sqrt{\frac{1}{n_1} +\frac{1}{n_2} } }

Sa^2= \frac{(n_1-1)S^2_1+(n_2-1)S^2_2}{n_1+n_2-2}

Sa^2= \frac{9*80.4609+9*116.64}{10+10-2} = 98.55

Sa= 9.93

t_{H_0}= \frac{86.8-79.5}{9.93\sqrt{\frac{1}{10} +\frac{1}{10} } } = 1.64

p-value: 0.118364

The p-value is greater than the significance level so the decision is to not reject the null hypothesis. This means that there is no significant evidence between the scores of the two groups.

b.

95% CI

(X[bar]-X[bar])±t_{n_1+n_2-2;1-\alpha /2}*Sa\sqrt{\frac{1}{n_1} +\frac{1}{n_2} }

t_{n_1+n_2-2;1-\alpha /2}= t_{18;1.975}= 2.101

(86.8-79.5)±2.101*(9.93\sqrt{\frac{1}{10} +\frac{1}{10} })

[-2.03; 16.63]

With a 95% confidence level, you'd expect that the interval [-2.03; 16.63] would contain the difference between the mean scores of the two classes.

c.

Considering that the null hypothesis wasn't rejected and that at the same level the confidence interval includes the zero, we can affirm that the format of the teaching materials, digital or regular textbooks, has no significant effect on the scores of the students.

I hope it helps!

3 0
4 years ago
Find the area of a 7-gon with side length 10. Round to a whole number.
Alja [10]
Answer:
n = 7
a = 10 m
r = 10.3826 m
R = 11.5238 m
A = 363.391 m2
P = 70 m
x = 128.571 °
y = 51.4286 °
7 0
3 years ago
Caine
garri49 [273]

Answer:

well sorry I dont understand you

3 0
3 years ago
Other questions:
  • Two card decks are drawn from a standard 52-card deck, without replacement. Find the probability that they are both aces.
    9·2 answers
  • Select whether the following statement is always true, sometimes true, or never true.
    15·1 answer
  • A large punch bowl holds 12 gallons of liquids.if five gallons of ginger ale have already been poured into the bowl,what is the
    12·2 answers
  • I will give 15 points to anyone who helps me! &lt;33333
    7·1 answer
  • Write the ratios for tan D
    6·1 answer
  • (b) What is the slope of y = -2x and what does this mean?
    15·2 answers
  • How can you use polygons to approximate the circumference and area of a circle?
    12·1 answer
  • How do you know which number in an exponential function controls how much it is stretched or compressed?
    9·1 answer
  • The function f(x) = 1(3)* models the number of virus cells present in a
    5·1 answer
  • Help please, totally don't know the answer to this.
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!