3 years ago

Identify the expression equivalent to 4(x+x+y)-2x+8+4 by substituting x=1 and x=2

Mathematics

1 answer:

Shtirlitz [24]3 years ago

4 0

4(1+1+2)-2(1)+8+4 you would just plug it in for x and y. And then solve the equation.

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At the moment a certain medicine is injected, its concentration in the bloodstream is 120 milligrams per liter.

igomit [66]

Answer:

$c(t) = 120 [0.7]^{t}$

Step-by-step explanation:

At the moment a certain medicine is injected, its concentration in the bloodstream is 120 milligrams per liter.

From that moment forward, the medicine's concentration drops by 30% each hour.

Therefore, the medicine concentration c(t) in mg/liters after t hours will be modeled as

$c(t) = c(0) [1 - \frac{30}{100}]^{t}$

⇒ $c(t) = c(0) [1 - 0.3]^{t}$

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Answer:

Common ratio r = 2

Step-by-step explanation:

$\because$ the fith term of a G.P is 8 times the 2nd term.

$\therefore \: t_5 = 8\times t_2 \\ \therefore \: ar^{5-1}=8\times \: ar^{2-1} \\ \therefore \: r^{4}=8\times \: r^{1} \\ \therefore \: r^{3}=8 \\ \therefore \:r^{3}= {2}^{3} \\ \hspace{20 pt}\huge \red{ \boxed{\therefore \:r= {2}}} \\$

Hence, common ratio is 2.

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What is the initial value of the equation shown? y = −7x − 6 −13 −7 −6 −1

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Answer:

-6.

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The equation is y = -7x - 6.

The initial value is found when x = 0.

y = -7(0) - 6

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50.24cm

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C = 2πr

C = 2(3.14)8

C = 3.14(16)

C = 50.24 cm

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