Cho ánh xạ tuyến tính f: R2 → R2 có ma trận của ánh xạ f theo cơ sở B={(1,1); (-1,0)} là: . Tìm công thức f(x, y).

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)