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soldi70 [24.7K]
3 years ago
5

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

Mathematics
2 answers:
miv72 [106K]3 years ago
4 0

Answer:

8

Step-by-step explanation:

<h2 />
Natasha2012 [34]3 years ago
3 0

Answer:

Yes, the answer is eight!

Step-by-step explanation:

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Which of the following is a solution of x2 + 2x + 4?
kifflom [539]

Answer:

−1 + i times the square root of 3

is the answer.

Step-by-step explanation:

Given is a quadratic equation in x

x^2+2x+4\\= x^2+2x+1+3\\=(x+1)^2+3

using completion of squares method

Equate to 0

(x+1)^2+3 =0\\(x+1)^2 = -3\\

Take square root

(x+1) = \sqrt{-3} =±i\sqrt{3}

Subtract one from both sides

x = [/tex]-1±i\sqrt{3}[/tex]

The last option namely

−1 + i times the square root of 3 only matches with our answre

Hence last option is right.

4 0
3 years ago
An airplane flew for 8 hours at an airspeed of x miles per hour (mph), and for 7 more hours at 325 mph. If the average airspeed
Thepotemich [5.8K]
E. 8x+7(325)=15(325)

It would include the 8 hrs. of x miles per hour and the 7 hrs. of 325 miles per hour, giving the total miles. Then, as you eliminate, you can find out what (x) is.
4 0
3 years ago
Mr. Osmond bought a computer that cost $2,500. How much did he pay for the computer if the sales tax rate was 7 present
9966 [12]

Answer:

$2,675

Step-by-step explanation:

7% of $2,500 is $175. Adding $2,500 and $175 gets you $2,675


Hope this helps, and I’d appreciate brainliest but if not it’s okay!

3 0
2 years ago
Read 2 more answers
Which equation represents the line that passes through the point (-2,5) and has a slope of - 3
OleMash [197]

Answer: Answer:

A. is your answer

When using the Slope Method, your answer is y - 5 = 4(x - 2).

Feel free to give brainliest.

Have a great day everyone!

7 0
2 years ago
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A 20,000 gallon tank is 3/4full. If the drain valve on this tank allows 2.5 gallons of water to be drained per minute, about how
patriot [66]

Answer:

100 Hours

Step-by-step explanation:

since the tank has 15,000 gallons of water. it drains at a rate of 150 gallons per hour so 15,000 divided by 150 equals 100

6 0
3 years ago
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