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3 years ago

By how many degree -2°Ccolder than 7°C

Mathematics

2 answers:

aalyn [17]3 years ago

8 0

Answer:

9 degrees celsius

Step-by-step explanation:

All you have to do is 7 - (-2) = 9.

Kay [80]3 years ago

7 0

Answer:

9°C

Step-by-step explanation:

If you count, it's 7-(-2), making them cancel out, equaling 7+2=9

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Four circles, each with a radius of 2 inches, are removed from a square. What is the remaining area of the square? (16 – 4π) in.

anyanavicka [17]

Since 4 circles are circumscribed by a square, then the side length of the square is 8

So the area of the square is 8^2 = 64

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3 years ago

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3 years ago

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3 years ago

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3 years ago

What is the radius of a circle given by the equation x2 + y2 – 2x + 8y – 47= 0? radius = units

il63 [147K]

ANSWER

The radius is 8

EXPLANATION

We were given,

${x}^{2} + {y}^{2} - 2x + 8y - 47 = 0$

We rewrite the above equation to obtain,

${x}^{2} - 2x \: \: \: \: + {y}^{2} + 8y \: \: \: \: = 47$

We now add half the square of the coefficient of
$x \: and \: y$
to both sides of the equation to get,

${x}^{2} - 2x + ( - 1) ^{2} + {y}^{2} + 8y + {(4)}^{2} = 47 + ( - 1) ^{2} + {4}^{2}$

We now got two perfect squares on the left hand side of the equation,

$(x - 1)^{2} + {(y + 4)}^{2} = 47 + 1 + 16$

$(x - 1)^{2} + {(y + 4)}^{2} =64$

$(x - 1)^{2} + {(y + 4)}^{2} = {8}^{2}$

By comparing to the general formula of the circle,

${(x - a)}^{2} + {(y - b)}^{2} = {r}^{2}$

We can see that the radius is 8.

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3 years ago

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By how many degree -2°Ccolder than 7°C​

By how many degree -2°Ccolder than 7°C