Answer:
27 and 23
Step-by-step explanation:
x + y = 50
x - y = 4
2x = 54
x = 27
y = 23
Answer:
4 and 12
Step-by-step explanation:
a = young
b = old
b = 3a, a+b =2a+8 => a = 4, b = 12
Answer:

Step-by-step explanation:
The general for for the equation of a circle is

Where a is the x coordinate of the centre, b is the y coordinate of the centre and r is the radius.
In your case, a=0, b=0, r=9
Substituting these values into the general form gives the answer.
48% of 25 is 12. I hope this helps