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3 years ago

30 POINTS!!!

Mathematics

1 answer:

Cloud [144]3 years ago

3 0

Answer:

A, C, & D

Step-by-step explanation:

A square root has the form $\sqrt[2]{x} = x^{1/2}$ and can be represented in exponential form. Let's convert all the expressions to $\sqrt{x}$ this form. 4 square root 5 is $4\sqrt{25} =\sqrt{16*5}=\sqrt{80}$

A. $2\sqrt{20} =\sqrt{4*20}=\sqrt{80}$

B. $6^{1/2}-5^{1/2} =\sqrt{6}-\sqrt{5}$

C. $3*5^{1/2}+5^{1/2} =3\sqrt{5}+\sqrt{5}=4\sqrt{5}=\sqrt{16*5}=\sqrt{80}$

D. $4*5^{1/2}=4\sqrt{5}=\sqrt{16*5}=\sqrt{80}$

E. $2\sqrt{10} =\sqrt{4*10}=\sqrt{40}$

F. $3*5^{1/2}=3\sqrt{5}=\sqrt{9*5}=\sqrt{45}$

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Step-by-step explanation:

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Art [367]

Answer:

a) $N_0=250\; k=0.15$

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Step-by-step explanation:

a) Initial number of bacteria is the coefficient, that is, 250. And the growth rate is the coefficient besides “t”: 0.15. It’s rate of growth because of its positive sign; when it’s negative, it’s taken as rate of decay.

Another way to see that is the following:

Initial number of bacteria is N(0), which implies $t=0$ . And $N(0)=N_0$ . The process is:

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d) $t_2=?\; (N_0→3N_0 \Longrightarrow 250 → 3\cdot250 =750)$

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