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SCORPION-xisa [38]
3 years ago
15

??????????????????????

Mathematics
2 answers:
tiny-mole [99]3 years ago
8 0

Answer:

254.34

Step-by-step explanation:

Good luck!

irga5000 [103]3 years ago
4 0

Answer:

A = 254.34

Step-by-step explanation:

Area of a circle formula:

A = πr²

r = d/2 = 9

A = 3.14(9²)

A = 3.14(81)

A = 254.34

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If one of the roots of the equation x²- 4x + k=0exceeds the other by 2, then find the roots and determine the value of k
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Answer:

roots: 1 and 3

k = 3

Step-by-step explanation:

2 roots: p and p+2

(x-p) (x-p-2) = x² - 4x + k

x² -2px -2x + p² + 2p = x² - 2 (p+1)x + (p² + 2p) = x² -4x + k

-2 (p+1) = -4

p+1 = 2

p = 1   ... root 1

p' = 1+2 = 3   ... root 2

k = p² + 2p = 3

check: (x-1) (x-3) = x² - 4x + 3 = x² - 4x + k

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