Scientists use the rule of 70 to calculate human
population growth.
According to the rule of 70, what is the doubling time
for a nation with a population growth rate of 5% per
year?

Answer:

A,C,D

Step-by-step explanation:

Irrational number that keep going and never stop that DONT have a pattern

For example

1/3=0.3

It keeps going on BUT it repeats therefore its rational

Another example

The square root of 13 is 3.6055.......

it keeps going on BUT it doesn't have a pattern therefore its irratianal

Answer:

60x + 42y

Step-by-step explanation:

60 x 10 = 60

7x6 = 42

Answer:

14/45

Explanation:

Make the denominator of both fractions the same

13/36=130/360

2/40=18/360

130/360-18/360=112/360

112/360=14/45

Answer:

lenght = 25 cm

widht = 15 cm

Step-by-step explanation:

Dimensions of the screen

375 = (l - 10) × l

375 = l² - 10l

l² - 10l -375 = 0

(l + 15)(l -25)

l = -15 or l = 25

lenght = 25 cm

widht = 25 - 10

widht = 15 cm

Answer:

Step-by-step explanation:

f(x) = 2/3 x + 3

x = 9

f(9) = 2/3 * 9 + 3            Divide 9 by 3

f(9) = 2 * 3 + 3               Combine 2 * 3

f(9) = 6 + 3                    Combine

f(9) = 9                          The answer is just a coincidence. The answer for the next one shouldn't be - 3

f(-3) = 2/3 *(-3) + 3         Divide 3 into - 3

f(-3) = 2*(-1) + 3

f(-3) = -2 + 3

f(-3) = 1

How was this done?

You should observe that whatever value you see on the left in the brackets, appears where the x is on the right. This is a very important concept. You should do your best to understand it because algebra is sort of based on it.

Answer:

17800

Step-by-step explanation:

a= (t-g)/-0.0035

(-32.3-30)/-0.0035 = 17800

Answer:

40,550

Step-by-step explanation:

That is the mid point

Answer:

-1

Step-by-step explanation:

1. To simplify this expression, let's go through the orders of operations:

Therefore, the answer is -1.

Your question is incomplete.

Update: A. -2.5

Answer:

Infinitely many solutions

Step-by-step explanation:

6x+18=2(3x+9)

6x+18=6x+18

Since both sides are equal to each other, then there are infinitely many solutions because no matter what x is, both sides will be equal to each other.

Answer:

infinite many solutions, (C)

Step-by-step explanation:

Once you distribute you get 6x+18 on both sides. Meaning that the answer is this has infinite many solutions.

Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day!

Step-by-step explanation:

cube answer=3

?^3=27

3^3=27

Answer:

3x3x3

Step-by-step explanation:

Since volume is height times width times length, it would be 3x3x3=27. Hope this helps!

Answer:

34 mph

Step-by-step explanation:

Average speed = total distance / total time

Total distance = ( 40 × 2 + 30 × 3 )

= 170 miles

Total time = 5 h

So, avg speed = 170/5 = 34 mph

Principal = $400

Rate = 8%

Time = 12 months

Answer:

$32 Interest but total amount after one year is $432

9514 1404 393

Answer:

  x = (y +2)/3

Step-by-step explanation:

The flowchart is trying to help you see that you "undo" what is done to x, in reverse order.

  x is first multiplied by 3, then -2 is added.

First, we want to undo the addition of -2, so we add the opposite of that to y:

  y = 3x -2   ⇒   y +2 = 3x

Then we want to undo the multiplication by 3, so we divide by 3:

 y +2 = 3x   ⇒   (y +2)/3 = x

The solution for x is ...

  x = (y +2)/3

_____

Additional comment

In your diagram, each box has the inverse operation of the one in the box above it. The inverse of subtracting 2 is adding 2. The inverse of multiplying by 3 is dividing by 3. The arrows connecting the boxes are intended to show you that these inverse operations occur in the reverse order of the original operations, as we described above. (The small box at bottom center might contain "3x".)

Answer:

441

Step-by-step explanation:

Answer:

20 minutes after 3:00

Step-by-step explanation:

Answer:

The answer would be 20 minutes after 3:00

Answer:

D. 24

Step-by-step explanation:

5x - 9 + 2x + 21 = 180

7x + 12 = 180

7x = 168

x = 24

Answer:

[tex]\frac{4}{21}[/tex]

Step-by-step explanation:

In order to find the answer you need to find the common denominator of the two fractions multiply the fractions to receive that common denominator and then subtract to find your answer.

[tex]\frac{1}{3} -\frac{1}{7}[/tex]

Find the common denominator:

[tex]CD=21[/tex]

[tex]1\times7=7[/tex]

[tex]3\times7=21[/tex]

[tex]=\frac{7}{21}[/tex]

[tex]1\times3=3[/tex]

[tex]7\times3=21[/tex]

[tex]=\frac{3}{21}[/tex]

[tex]\frac{7}{21} -\frac{3}{21}[/tex]

Subtract numerators

[tex]7-3=4[/tex]

[tex]=\frac{4}{21}[/tex]

Hope this helps.

Answer:78

Step-by-step explanation:

Answer:

19.5

Step-by-step explanation:

side is 6.5 bigger, so minus the 6.5 from the total perimeter of 65 and divide by 3.

65- 6.5 = 58.5

58.5 ÷ 3 = 19.5

equal sides are 19.5

longer side is 19.5 + 6.5

Answer:

19.5 inches

Step-by-step explanation:

You can interpret this problem as x + x + (x + 6.5)=65, with x being the length of the equal sides.

Simplified, this equation becomes 3x+6.5=65.

Solving, this becomes 3x+6.5-6.5=65-6.5 which comes out as 3x=58.5. Next, we divide this equation by 3 on both sides, which then comes out to x=19.5. Therefore, the length of equal sides are 19.5.

Check: There are two equal sides, so 19.5+19.5. Since the base is 6.5 inches bigger than either of the equal sides, the base is equal to 19.5+6.5=26. Adding these values all together comes out to 19.5+19.5+26=65.

Answer:

1: the number after is equal to the number before plus 1

2: the number after is equal to the number before plus 4

Step-by-step explanation:

Answer:

the length would be 3ft and the width would be 2ft

Step-by-step explanation:

this is because the scale is 1cm:4f ft therefore, 12/4=3 and 8/4=2 which is your final answer

Answer:

LENGTH - 3cm / WIDTH - 2cm

Step-by-step explanation:

Well first off, you would use the scale: 1 cm = 4 ft

With 12, you divide by 4. 12 ÷ 4 = 3

With 8, you also divide by 4. 8 ÷ 4 = 2

So, it would be 3 cm long and 2 cm wide.

Answer:

9834

Step-by-step explanation:

11*100*89400.

Answer:

-19

Step-by-step explanation:

Previous position in sea + change in position= current position

-26+7= -19

Hope this helps! :)

Answer:

It is -19

Step-by-step explanation:

Well, you would do this -26 + 7 because the diver dove 26 feet BELOW sea level, which is also -26. He then ascends 7 feet, which means he is coming UP. So -26 + 7 = -19.

Answer:

7/66

Step-by-step explanation:

Step-by-step explanation:

48 divided by 4, is 12

or 12/1

Answer: I think y is 32 im not good at this tho

Step-by-step explanation:

Answer:

3x + (5x -2)

Step-by-step explanation:

X is any number so 3 times a number is 3x. -2 plus 5 times a number is the same as 5 times a number minus 2. And the sum would be 3x + (5x - 2)

Answer:

v = 9.5

Step-by-step explanation:

[tex] \\ \tt \frac{4}{5} (v - 7) = 2[/tex]

[tex] \\ \tt \mapsto \frac{4(v - 7)}{5} = 2[/tex]

[tex] \\ \tt\mapsto \frac{4v - 28}{5} = 2[/tex]

[tex] \\ \tt \mapsto4v - 28 = 2 \times 5[/tex]

[tex] \\ \tt \mapsto4v - 28 = 10[/tex]

[tex] \\ \tt \mapsto4v = 10 + 28[/tex]

[tex] \\ \tt \mapsto \: v = \frac{38}{4} [/tex]

[tex] \\ \tt \mapsto \: v = 9\frac{2}{4} \: or \: 9.5 [/tex]