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nordsb [41]
3 years ago
13

Pls help i give u brainliest and 5 stars ​

Mathematics
2 answers:
Harrizon [31]3 years ago
7 0

Answer:

1932.4816

Step-by-step explanation:

The formula for SA of a cube is 4πr² so half is 2πr² and sing the radius is 7 the answer is 1932.4816 cm²

Umnica [9.8K]3 years ago
3 0

Answer:

Step-by-step explanation:

Diameter = 14 cm

r = 14/2 = 7 cm

Outer surface area of hemisphere =2πr²

      = 2π*7*7

      = 98π cm²

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Translate the following statement to an inequality.
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Answer:

Step-by-step explanation:

a number no less then 15

let the number be x

no less then 15....means it has to be 15 or more

x > = 15 (thats greater then or equal to)

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Which expression is equivalent to 83⋅ 8−7
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Next time add an image, but know that the expression is equal to 657 since..

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lianna [129]

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Step-by-step explanation:

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A city starts with a population of 500,000 people in 2007. Its population declines according to the equation
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Answer: After 7 years the population will be one-half the initial amount.

Step-by-step explanation:

Given: Initial population = 500,000

The population declines according to the equation:

P(t) = 500,000e^{ -0.099t}, where P is the population in t years later.

One-half the initial amount = 0.5 x 500,000

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Put P(t)=250,000, we get

250000=500000e^{-0.099t}\\\\\Rightarrow\ \frac{500000e^{-0.099t}}{500000}=\frac{250000}{500000}\\\\\Rightarrow\ e^{-0.099t}=\frac12\\\\\Rightarrow\ -0.099t=\ln \left(\frac{1}{2}\right)\\\\\Rightarrow\ t=\frac{1000\ln \left(2\right)}{99}=\frac{1000(0.69314)}{99}\\\\\Rightarrow\ t=7.00148\approx7

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