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Andru [333]
2 years ago
5

Suppose that an insect population’s density, in thousands per acre, during year n, can be modeled by the recursive formula: a1 =

8 an = 2. 9an – 1 – 0. 2(an – 1)2 Which of the following describes what is happening to the insect population for the first five years? The population density decreases each year. The population density increases each year. The population density remains constant. The population alternates between increasing and decreasing.
Mathematics
1 answer:
alexdok [17]2 years ago
4 0

Answer:

D) The population alternates between increasing and decreasing

Step-by-step explanation:

correct on edge

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the units digit of a two-digit number is twice the tens digit. If the digits are reversed, the new number is 9 less than the ori
Anton [14]

Answer:

36

Step-by-step explanation:

Here is the correct and complete question: The units digit of a two-digit number is twice the tens digit. If the digits are reversed, the new number is 9 less than twice the original number. What is the original number?

Lets assume the original number be"10y+x". (x is unit digit and y is 10th digit)

∴ if number is reversed then resulting number be "10x+y".

As given: x= 2y

        and 10x+y= 2(10y+x)-9

Now, solving the equation to get original number.

10x+y= 2(10y+x)-9

Distributing 2 to 10y and x, then opening the parenthesis.

⇒ 10x+y= 20y+2x-9

subtracting by (2x+y) on both side.

⇒ 8x= 19y-9

subtituting the value of "x", which is equal to 2y.

∴ 8\times 2y= 19y-9

⇒ 16y=19y-9

subtracting both side by (16y-9)

⇒ 3y= 9

cross multiplying

We get, y= 3

y=3

∵x= 2y

x=2\times 3= 6

∴ x= 6

Therefore, the original number will be 36 as x is the unit number and y as tenth number.

6 0
3 years ago
Pls help me answer 2.2.3 and 2.2.4 <br>(2.2.4 needs to be converted)<br>ill give brainstorm​
Anarel [89]

\bold{\huge{\underline{ Solution }}}

<h3><u>Analysis </u><u>of </u><u>graph </u><u>:</u><u>-</u></h3>

We have given one graph which is plot between distance and time. where time is in minutes and distance is in seconds.

<u>According </u><u>to </u><u>the </u><u>graph </u>

  • For the first 5 minute ( O to A) , The distance is continously increasing 2m / per minute .
  • For the 5 minute that is from 5 minute to 13 minute ( A to B) both marellize and her dog wally moving with the constant speed .
  • For next 3 minutes that is from 10 minutes to 13 minutes ( B to C) , The distance is continously decreasing with time .
  • For next 3 minutes that is from 13 to 16 minutes ( C to D) , Again they moved with constant speed .
  • For next 6 minute that is from 16 to 21 minutes ( D to E) . Again, There distance is increasing with time .
  • Again For next 4 minutes that is 21 to 25 minutes , they are moving with constant velocity .

<h3><u>Let's </u><u>Begin </u><u>:</u><u>-</u></h3>

1) Between O and A

  • The marellize and wally when moving between O to A , The distance is constantly increasing with time.
  • The graph is Straight line

2) Between A and B

  • The marellize and wally when moving between A to B, The distance remains the same with time that is they moving with constant speed.
  • The graph is constant or steady

3) Between B to C

  • The marellize and wally when moving between B to C, The distance is constantly decreasing with time .
  • The graph is straight line but it follows decreasing function .

4) For covering the First 6 km ,

<u>According </u><u>to </u><u>the </u><u>graph</u><u>, </u>

  • For covering first 6 km, They took 3 minutes.

5) No, Marellize and wally walk does not from where they have started.

<u>According </u><u>to </u><u>the </u><u>graph </u>

  • It is end at 5 m instead of 0m .
3 0
2 years ago
Help please quickly
Irina18 [472]

Answer:

:::::::::::::::::::

D

3 0
3 years ago
What is the area of Figure ABCD?
Veseljchak [2.6K]
66 square inches
Area of rectangle plus area of triangle
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The answer is x equals 1
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