Which shows the correct way to use expanded form to multiply 8,430 x 1,000?
(800 + 40 + 3) x 1,000 = 800,000 + 40,000 + 3,000
(800 + 400 + 30) 1,000 = 800,000 + 400,000 + 30,000
(8,000 + 400 + 3) x 1,000 = 8,000,000 + 400,000 + 3,000
(8,000 + 400 + 30) × 1,000 = 8,000,000 + 400,000 + 30,000

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)