3 years ago

What's the circumference?

2 answers:

8 0

There are 2 formulas for Circumference in common use. One, which is more useful here, is C = pi d, where d is the diameter. So, the C here is pi times 20 cm.
The other formula is C =2 pi r. This makes sense, since 2r=d.

zepelin [54]3 years ago

6 0

The circumference is 62.8

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3 years ago

Solve x2 − 8x + 5 = 0 using the completing-the-square method. (2 points)

RoseWind [281]

Answer:

$x = 4 + \sqrt{11}, \: \: x = 4 - \sqrt{11}$

Step-by-step explanation:

${x}^{2} -8x + 5 = 0 \\ \\ {x}^{2} - 8x + {4}^{2} = - 5 + {4}^{2} \\ \\ {(x - 4)}^{2} = - 5 + 16 \\ \\ {(x - 4)}^{2} = 11 \\ \\ x - 4 = \pm \sqrt{11} \\ \\ x = 4 \pm \sqrt{11} \\ \\ x = 4 + \sqrt{11}, \: \: x = 4 - \sqrt{11}$