For i = V-1, what is the sum (7 + 3i) + (-8 + 9i)?

What properties allow transformation to be used as a problem solving tool

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)

2x minus y equals 6, x plus y equals negative 3