A culture of bacteria has an initial population of 640 bacteria and doubles every 2 hours. Using the formula Pt = Po 28, where P is the population after t hours, Po
is the initial population, t is the time in hours and d is the doubling time, what is the
population of bacteria in the culture after 7 hours, to the nearest whole number?

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Ответ:

fathimasaynas2975

23.11.2021

Mathematics

14 units

Step-by-step explanation:

We are given that the area between two concentric circles is $49\pi$

We have to find the length of chord in the larger circle that is tangent to the smaller circle.

Let r_1,r_2 be the radius of two circles.

r_1 be the radius of small circle and r_2 be the radius of large circle

We know that area pf circle= $\pi r^2$

Area of large circle = $\pi r^2_2$

Area of small circle = $\pi r^2_1$

Area between two circles = $49\pi$

Area of large circle -Area of small circle= $49\pi$

$\pi r^2_2-\pi r^2_1=49\pi$

$\pi(r^2_2-r^2_1)=49$

By pythagorus theorem

AD^2=OA^2-OD^2

AD^2=r^2_2-r^2_1

AD=49

$AD=\sqrt{49}=7$

Length of chord= $2\cdot AD$

Hence, the length of chord of the larger circle = $2\cdot7=14$ units

Suppose that the area between a pair of concentric circles is 49pi. find the length of a chord in th

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