Answer:
9
Step-by-step explanation:
Compare your x2 + y2=81 to the following:
x^2 + y^2 = 81
The " ^ " symbol indicates exponentiation.
Now compare x^2 + y^2 = 81 to
x^2 + y^2 = r^2.
This is the standard equation of a circle of radius r centered at the origin, (0,0). You can see for yourself that 81 must equal r^2.
Taking the square root of 81, we get plus or minus 9.
But the radius must be positive, so we reject the -9 and take +9.
The radius is 9.
B. attend fewer movies.
He should put more time into cutting grass but that's not an option. He doesn't have any more to put into savings and he's already over budget for his movies/music purchases. The only logical solution would be B.
A is the answer hope this helps
Only one, if you want to know the measurement of the other side use the cosine law and to know the other angles use the sine law :)
