FOR 100 POINTS IF U HELP ILL SEND U 60 MORE POINTS plz show/explain ur work- how u know pls

1. 144= -12 (x+5)

2. 8n+7=31

3. -9 x -13 + -103

4. 7 (9+K) = -84

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)