A radio station has a broadcast area in the shape of a circle with equation x^2+y^2=5,625

, where the constant represents square miles.

a) Find the intercepts of the graph.
b) State the radius in miles.
c) What is the area of the region in which the broadcast from the station can be picked up?

Please explain how you got your answer! I'd really appreciate it!!

The american academy of pediatrics wants to conduct a survey of recently graduated family practitioners to assess why they did not choose pediatrics for their specialization. provide a definition of the population, suggest a sampling frame, and indicate the appropriate sampling unit.

Find the solution of each of the following.

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.