David told jen, "write three two-digit numbers. i'll add three more and give you the sum right away." jen wrote 53, 42, and 31.then david wrote 46, 57, and 68 and said the sum was 297. was he right? what pattern did he use?

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)