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raketka [301]
3 years ago
11

A colony of 15,000 bacteria doubles in size every 42 hours. What will the population be 84 hours from now?

Mathematics
1 answer:
Nuetrik [128]3 years ago
7 0

Answer:

30,000

Step-by-step explanation:

You simply multipy the 15,000 by two since it is doubling. *4 is double of 42 which is why you would multiply by two.

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Four times a number minus twice another number is -8. The sum of the two number is 19.Find the numbers
grigory [225]
1. To solve this exercise, you must make a system of equations.

 2. You have that f<span>our times a number minus twice another number is -8:
</span>
 4x-2y=-8

 3. And t<span>he sum of the two number is 19:
</span>
 x+y=19

 4. As you can see, you have two equations:

 4x-2y=-8   (i)
 x+y=19     (ii)

 5. Let's clear the "x" from the equation (ii):

 x=19-y

 6. Now, you need to susbtitute x=19-y into the equation (i):

 4x-2y=-8
 4(19-y)-2y=-8
 76-4y-2y=-8
 76-6y=-8
 -6y=-8-76
 -6y=-84
 y=-84/-6
 y=14

 7. You must susbstitute y=14 into the equation (ii) and clear "x":

 x+y=19
 x+14=19
 x=19-14
 x=5

 The answer is: 5 and 14
6 0
3 years ago
Find each percent decrease. Round to the nearest percent.
Vsevolod [243]

Answer:

67%

Step-by-step explanation:

First of all, we must find the decrease;

39 - 13

=26

Then we can find the percentage decrease

26/13 ×100 =66.666..which can be written as 67.

5 0
2 years ago
Which of the following expressions is always equivalent to -2b + 4 + 4b - 7
spayn [35]

Answer:

c. 2b - 3

Step-by-step explanation:

Simplify the following:

-2 b + 4 + 4 b - 7

Grouping like terms, -2 b + 4 + 4 b - 7 = (4 b - 2 b) + (4 - 7):

(4 b - 2 b) + (4 - 7)

4 b - 2 b = 2 b:

2 b + (4 - 7)

4 - 7 = -3:

Answer:  2 b + -3

3 0
3 years ago
Read 2 more answers
The price of 14 bowls, 9 pans and 12 dishes is $135;
Marysya12 [62]

Answer:

$94

Step-by-step explanation:

Let the price of a bowl, a pan and a dish be $b, $p and $d respectively.

14b +9p +12d= 135 -----(1)

10b +6p +8d= 88 -----(2)

Subtracting equation (1) with equation (2):

14b +9p +12d -(10b +6p +8d)= 135 -88

Expand:

14b +9p +12d -10b -6p -8d= 47

4b +3p +4d= 47

Multiply both sides by 2:

8b +6p +8d= 47(2)

8b +6p +8d= 94

Thus, the price of 8 bowls, 6 pans and 8 dishes is $94.

4 0
2 years ago
A recent study claimed that in any given month, for every 5 text messages a boy sent or received, a girl sent or received 7 text
morpeh [17]
I believe so! The number of texts sent or received by boys is proportional to the number of texts sent or received by girls! Have a nice day!
5 0
3 years ago
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