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Aneli [31]
3 years ago
9

A bacterial cell can double in number every 20 minutes. If one bacterial cell was present at the start of an experiment. How man

y cells would be present after 4 hours
Mathematics
2 answers:
kakasveta [241]3 years ago
7 0
There would be 4096 bacteria cells present.

2^12 = 4096
Alik [6]3 years ago
5 0

60 minuets are in 1 hour, and it will split up times in an hour, that means that there will be cells present.

20 minutes = 2 cells

40 minutes = 4 cells

1 hour = 8 cells

1 hour 20 minutes = 16 cells

1 hour 40 minutes = 32 cells

2 hours = 64 cells

2 hours 20 minutes = 128 cells

2 hours 40 minutes = 256 cells

3 hours = 512 cells


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6. Pamel bought an electric drill at 85% of the regular price. She paid $276,25 for
Katen [24]

Answer:

£325

Step-by-step explanation:

She paid £276.25 which is 85%

Divide 276.25 by 85 which is 3.25

3.25 is 1%

Multiply 3.25 by 100 to get the full Price

3.25 x 100 = £325

3 0
3 years ago
Y=x^2 -9x at x = 4 Find an equation of the tangent an an equation of the normal
Montano1993 [528]

The tangent line to <em>y</em> = <em>f(x)</em> at a point (<em>a</em>, <em>f(a)</em> ) has slope d<em>y</em>/d<em>x</em> at <em>x</em> = <em>a</em>. So first compute the derivative:

<em>y</em> = <em>x</em>² - 9<em>x</em>   →   d<em>y</em>/d<em>x</em> = 2<em>x</em> - 9

When <em>x</em> = 4, the function takes on a value of

<em>y</em> = 4² - 9•4 = -20

and the derivative is

d<em>y</em>/d<em>x</em> (4) = 2•4 - 9 = -1

Then use the point-slope formula to get the equation of the tangent line:

<em>y</em> - (-20) = -1 (<em>x</em> - 4)

<em>y</em> + 20 = -<em>x</em> + 4

<em>y</em> = -<em>x</em> - 24

The normal line is perpendicular to the tangent, so its slope is -1/(-1) = 1. It passes through the same point, so its equation is

<em>y</em> - (-20) = 1 (<em>x</em> - 4)

<em>y</em> + 20 = <em>x</em> - 4

<em>y</em> = <em>x</em> - 24

3 0
3 years ago
The equation of a line is -6x-2y=-18<br> What is the x-intercept of the line?
Fed [463]

 -6x - 2y = -18

-6x - 2(0) = -18

   -6x - 0 = -18

        -6x = -18

         -6      -6

           x = 3

hope this helps :)

8 0
2 years ago
Read 2 more answers
Jasmine has a bag of 48 peanuts. She eats 3/4 of the bag during the baseball game. How many peanuts does she have left? Explain
rosijanka [135]

Answer:

12

Step-by-step explanation:

If she eats 3/4 of the bag, that means she has 1-3/4 = 4/4 -3/4 = 1/4 of the bag left

The bag has 48 nuts. Take the number of nuts times the 1/4 she has left

48 * 1/4 = 12

She has 12 nuts left

7 0
3 years ago
18 × (-2) ÷ 5 enter your anwser in decimal form
Blizzard [7]

Answer:

7.2

Step-by-step explanation:

first divide -2 by 5= -2/5

multiply 18 by -2/5=-36/5

divide 36 by 5=7.2

4 0
3 years ago
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