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

Mathematics

2 answers:

miv72 [106K]2 years ago

4 0

Answer:

Step-by-step explanation:

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Natasha2012 [34]2 years ago

3 0

Answer:

Yes, the answer is eight!

Step-by-step explanation:

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If 5.7 moles of zinc metal react with 8.9 moles of silver nitrate, how many moles of silver metal can be formed, and how many mo

Dima020 [189]

The balanced equation is

Zn + 2 AgNO3 = Zn(NO3)2 + 2 Ag 

the ratio between Zn and AgNO3 is 1 : 2 

moles AgNO3 required = 5.7 x 2 =11.4 

we have only 8.9 moles of AgNO3 so it is the limiting reactant 

moles Zn needed = 8.9/2=4.45 

moles Zn in excess = 5.7 - 4.45 =1.25 ( or 1.3 at two significant figures)

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

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2 years ago

Which expression is equivalent to 5(4x+3)-2x?a 18x+15b 18x+3c 7x+8d 2x+8

kiruha [24]

Answer:

Which expression is equivalent to 5(4x+3)-2x?a 18x+15b 18x+3c 7x+8d 2x+8

A-18x+15

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2 years ago

3(2-b) < 10-3(b-6) please help

Sonbull [250]

3(2-b)<10-3(b-6)
6-b<5(b-6)
6-b<5b-30
Let's make "b".......2
6-(2)<5(2)-30
4<10-30
4<-20
In this case, this is a false statement. You can make "b" any number and I chose 2. I hope this helped!

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2 years ago

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The height of a ball above the ground as a function of time is given by the function h(t)=−32t2+8t+3 where h is the height of th

gavmur [86]

Answer:

0.125 seconds.

Step-by-step explanation:

We have been given that the height of a ball above the ground as a function of time is given by the function $h(t)=-32t^2+8t+3$ , where h is the height of the ball in feet and t is the time in seconds.

We can see that our given equation is a downward opening parabola as its leading coefficient is negative. The maximum point will be vertex of parabola.

To find the time, when the ball would be at its maximum height, we need to find the x-coordinate of vertex.

Using formula $\frac{-b}{2a}$ , we will find the x-coordinate of vertex of parabola as: