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.
Answer:
x=1000 or 10 to the 3rd power
10 x 40 = 400 so the answer is 400 pieces of chalk.
Answer:
113.1 =VOLUME , 4/3 X 3.14 (3) ^3 = 113.1
Answer:
no entiendo :C
Step-by-step explanation:
