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Evgesh-ka [11]
3 years ago
7

Carla must ice a german chocolate cake. The diameter of the cake is 6 cm. Use the formula A = 3.14 x r2 to find the area of the

cake.
A) 7.07


B) 19.63
Eliminate

C) 20.56


D) 28.26
Mathematics
2 answers:
blsea [12.9K]3 years ago
6 0
Diameter = 6    6/2 = 3
Radius = 3            3 to the power of 2 = 9
A = (3.14)(9) = 28.26
Sever21 [200]3 years ago
3 0
The radius(r) is half the diameter. So just plug 3 into the equation A=πr². A=3π². The area is about 29.60 (which I think you meant to write for D).
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x    -  Alma's given number

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3 years ago
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Answer:

A

Step-by-step explanation:

We are given the function:

\displaystyle f(x) = \left\{        \begin{array}{ll}            2\cos(\pi x) \text{ for }  x \leq -1 \\ \\          \displaystyle   \frac{2}{\cos(\pi x)}\text{ for } x > -1        \end{array}    \right.

And we want to find:

\displaystyle \lim_{x\to -1}f(x)

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Since we are approaching from the left, we will use the first equation:

\displaystyle =\lim_{x\to -1^-}2\cos(\pi x)

By direct substitution:

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Right-Hand Limit:

\displaystyle \lim_{x\to -1^+}f(x)

Since we are approaching from the right, we will use the second equation:

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Direct substitution:

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So, we can see that:

\displaystyle \displaystyle \lim_{x\to-1^-}f(x)=\displaystyle \lim_{x\to -1^+}f(x) =-2

Since both the left- and right-hand limits exist and equal the same thing, we can conclude that:

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Answer:

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Substitute r^2=49 in equation (1).

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