Answer:
Step-by-step explanation:
Subtract 20x
add 15
Combine like terms
Divide by -25 (NOTE: When dividing or multiplying by negative numbers the inequality sign flips.)
{(2,5),(7,3)} is the inverse relation of the function {(5,2),(3,7)} truth or false
1 answer:
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Answer:
The correct options are a,b.
Step-by-step explanation:
The area of sector of a circle equals
Area of a sector =
where
is the angle subtended at the center by the sector
is the radius of circle
This indicates that area of the sector depends on:
1) Radius of circle
2) Angle subtended at the center by the sector
3) Area of sector does not depend on pi.
Also if we know the area of the sector only we cannot calculate area of area of whole triangle as we need one more information either angle of the sector and vice versa.
We know that:
is an equation of a circle.
When we substitute x and y (from the pairs we have), we'll get a system of equations:
and all we have to do is solve it for a, b and r.
There will be:
From equations (II) and (III) we have:
and from (I) and (II):
Now we can easly calculate a and b:
Finally we calculate
:
And the equation of the circle is:
is an equation of a circle.
When we substitute x and y (from the pairs we have), we'll get a system of equations:
and all we have to do is solve it for a, b and r.
There will be:
From equations (II) and (III) we have:
and from (I) and (II):
Now we can easly calculate a and b:
Finally we calculate
And the equation of the circle is: