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nignag [31]
3 years ago
6

Calculate the circumference and area of this circle. 4cm radius​

Mathematics
2 answers:
BigorU [14]3 years ago
7 0

Answer: Using the formula,

Area=π×r2.

Area=π×r2.

=π×(4 cm)2.

=16π cm2≈50.24 cm2.

Step-by-step explanation:

Alja [10]3 years ago
5 0

Answer:

the circumference is 25.133 and the area is 50.265

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Suppose that the world's current oil reserves is R = 1820 billion barrels. If, on average, the total reserves
iVinArrow [24]

Answer:

A. R = -18t + 1,820

B. 1,568 billions of barrels

C. approximately 101.11 years

Step-by-step explanation:

To make our equation, we'll use the form R = mt + b. M represents how many billion barrels of oil are being lost each year, which we know is 18 billion. So -18 will be our m. B is how many total barrels of oil there are, which is 1,820. So 1,820 will be our b. Now the equation looks like this:

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We can use this equation to answer Part B.

Replace the t with 14:

R = -18(14) + 1,820

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R = -18(14) + 1,820

R = -252 + 1,820

R = 1,568

14 years from now, there will be 1,568 billions of barrels left.

To solve part C, we need to find how many years it will take for all of the oil to be used up. After it's all used up, the total amount of oil will be 0, so we can replace R with 0 and then solve for t:

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After approximately 101.11 years, all of the oil will be used up.

3 0
2 years ago
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