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4 years ago

The radius of a circle is 8 cm Calculate the circumference of the circle [Use pi r = 3.1]

Mathematics

1 answer:

denis-greek [22]4 years ago

8 0

Answer:

49.6cm

Step-by-step explanation: First you have to find the diameter of the circle by multiplying the radius by 2.

8x2=16

Then multiply 16 by 3.1

16x3.1=49.6

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What is the exact solution for the equation

Nostrana [21]

Answer:

Option C is correct.

Exact solution of $2^{x+2} = 5^{2x}$ is, $\frac{2\ln 2}{2\ln 5 - \ln 2}$

Step-by-step explanation:

Given the equation: $2^{x+2} = 5^{2x}$

Using logarithmic rules:

$a^x=b^y$ ⇒ $x \ln a =y \ln b$

$\ln x^a = a\ln x$

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Using distributive property i.e $a\cdot (b+c) = a\cdot b + a\cdot c$

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Divide both sides by $(2\ln 5 - \ln 2)$ we get;

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