Circle a has a diameter of 9 inches, a circumference of 28.26 inches, and an area of 63.585 square inches. the diameter of circle b is 5 inches, the circumference is 15.70 inches, and the area is 19.625 square inches..

part a: using the formula for circumference, solve for the value of pi for each circle.

part b: use the formula for area and solve for the value of pi for each circle.

part c: what observation can you make about the value of pi for circles a and b?

In a sample of 2023 u.s. adults, 373 said franklin roosevelt was the best president since world war ii. two u.s. adults are selected at random from the population of all u.s. adults without replacement. assuming the sample is representative of all u.s. adults, complete parts (a) through (d). (a) find the probability that both adults say franklin roosevelt was the best president since world war ii. the probability that both adults say franklin roosevelt was the best president since world war ii is (round to three decimal places as needed.) (b) find the probability that neither adult says franklin roosevelt was the best president since world war ii. the probability that neither adult says franklin roosevelt was the best president since world war ii is (round to three decimal places as needed.) (c) find the probability that at least one of the two adults says franklin roosevelt was the best president since world war ii. the probability that at least one of the two adults says franklin roosevelt was the best president since world war ii is (round to three decimal places as needed.) (d) which of the events can be considered unusual? explain. select all that apply. the event in part left parenthesis a right parenthesis is unusual because its probability is less than or equal to 0.05. the event in part (b) is unusual because its probability is less than or equal to 0.05. none of these events are unusual. the event in part (c) is unusual because its probability is less than or equal to 0.05.

Does the point (1, sqrt 7) lie on circle shown.

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)