Answer:
A.
Step-by-step explanation:
In the attached file
Answer:
Step-by-step explanation:
Distribute the brackets.
Add 
on both sides.
Divide 
on both sides.
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:
8,791- 2,899= 5892
Step-by-step explanation:
Melinda ran 5,892 more meters on monday than tuesday
