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il63 [147K]
3 years ago
12

Write the equation of the circle: Center at P(2 , -1) and a diameter of 10m

Mathematics
1 answer:
Viefleur [7K]3 years ago
4 0
An equation of the circle is
(x-h)² +(y-k)² =r²,
where (h,k) are coordinates of the center of the circle, and r is a radius of the circle.
We have h=2, k= -1, and radius r=diameter/2=10/2=5.

The equation of our circle is 
(x-2)²+(y+1)²=25

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Answer:

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Step-by-step explanation:

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7 0
3 years ago
Martin had 7 pounds of grapes left, and he gave away 2 5 of them. Explain how to use compatible numbers to estimate the amount o
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Compatible numbers are numbers which are easy to do mental calculation. For example is when doing division like 25 and 5, 100 and 10, and 36 and 6.

First, we know that: 7 pounds=5 pounds + 2 pounds

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In mathematics, the word “of” means to multiply. So:

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Replacing 7 with 5 and 2:

                                                                = (5+2)*(2/5)

Using the distribution principle:

                                                =5*(2/5) + 2*(2/5)

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3 0
3 years ago
Read 2 more answers
Mark is investing $8,000 in an account paying 5.5% interest compounded monthly.
agasfer [191]

Answer:

The formula is F = P(1 + interest percent)^n

Here,

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n =7 x 12 =84 (compounded monthly)

=>  Mark's account balance after 7 years

F = 8000*(1+0.004583)^84 =11746.2503 dollar

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