In the figure below, both circles have the same center, and the radius of the larger circle is r. if the radius of the smaller cirle is 3 units less than r, which of the following represents the area of the shaded region?

Carter drank 15.75 gallons of water in 4 weeks. he drank the same amount of water each day.a. estimate how many gallons he drank in one day.b. estimate how many gallons he drank in one week.c. about how many days altogether will it take him to drink 20 gallons?

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?