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3 years ago

15

four sisters bought a present for their father. They receive a 10% off discount on the original price o the gift. After the disc

ount was taken, each sister paid $9.00 what was the original price of the gift

1 answer:

valina [46]3 years ago

8 0

the answer should be $40.00

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If x+y+z=9, xy+yz+zx =26; find x²+y²+z²

vichka [17]

<em>First, we must expand and simplify :</em>
$x + y+z = 9$

$(x + y+z)^{2} = (9)^{2}$

$x^{2} + y^{2}+z^{2} + 2(xy + yz+zx) = 81$

<em>And Than, Enter the value :</em>
$x^{2} + y^{2}+z^{2} + 2(26) = 81$

$x^{2} + y^{2}+z^{2} + 52 = 81$

$x^{2} + y^{2}+z^{2} = 81- 52$

$\boxed{x^{2} + y^{2}+z^{2} = 29}$

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3 years ago

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2. Write the number in standard form.

user100 [1]

41,984 idk what the last line is for

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3 years ago

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The figure is made up of 2 cones and a cylinder. The cones and cylinder have a 4 cm diameter.

Ilya [14]

Answer:

62.84

Step-by-step explanation:

Volume of both cones is approximately 12.57

formula= pi*r^2*h/3

Volume of the cylinder is approximately 37.7

formula= pi*r^2*h

you add the volumes

12.57+12.57+37.7

= 62.84

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3 years ago

vova2212 [387]

Answer:

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3 years ago

(2.3 x 108)/(9.8 x 108)

QveST [7]

Answer: 9.45

Step-by-step explanation:

2.3 * 108 = 248.4

9.8 * 108 = 1,058.4

248.4 divided by 1,058.4 = 9.45

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3 years ago