Enter a simplified expression to represent the situation.
Circle A has a radius of (x + 3) units. A larger circle, B, has a radius of (x + 7) units. Use the formula
A = 12 to enter an expression for the difference in the areas of the circles. Leave your answer in terms of
1. Then use 3.14 for it to approximate to the nearest whole number the difference in the areas when x =
17.
The expression for the difference in the areas of the circles is
square units.
When x = 17, the difference is approximately
square units.