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faltersainse [42]
2 years ago
6

Solve for x: 3.2x - 7.4 = -7.8x + 3.6 1. 1 2. 0.8 3 3.8 4. 0.5

Mathematics
1 answer:
Elan Coil [88]2 years ago
6 0

Answer:

The value of x is 1.

Step-by-step explanation:

You have to move all the x-terms to one side and the unrelated values to other side :

3.2x - 7.4 =  - 7.8x + 3.6

3.2x + 7.8x = 3.6 + 7.4

Next, you have to add up :

11x = 11

Lastly, you have to divide it by 11 :

x = 11 \div 11

x = 1

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Circumference of a circle - derivation

This page describes how to derive the formula for the circumference of a circle.

Recall that the definition of pi (π) is the circumference c of any circle divided by its diameter d. Put as an equation, pi is defined as

π

=

c

d

Rearranging this to solve for c we get

c

=

π

d

The diameter of a circle is twice its radius, so substituting 2r for d

c

=

2

π

r

If you know the area

Recall that the area of a circle is given by

area

=

π

r

2

Solving this for r

r

2

=

a

π

So

r

=

√

a

π

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c

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2

π

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