*50 POINTS* Rosa is making a poster that has a rainbow as part of the design. Using a string and a pencil she makes a compass. She draws a semicircle that has a radius of 18 centimeters. Using the same center point, she draws another semicircle that has a radius of 12 centimeters.

What is the area of the shaded part of the rainbow?
A) 282.6 cm
B) 113.04 cm
C) 508.68 cm
D) 452 16 cm

Acertain population of bacteria demonstrates exponential growth doubles in size every 4 days. how long will it take the population to triple in size?

The formula for the lateral area of a right cone is la = rs, where r is the radius of the base and s is the slant height of the cone.which are equivalent equations?

Adoctor administers a drug to a 38-kg patient, using a dosage formula of 50 mg/kg/day. assume that the drug is available in a 100 mg per 5 ml suspension or in 500 mg tablets. a. how many tablets should a 38-kg patient take every four hours? b. the suspension with a drop factor of 10 ggt/ml delivers the drug intravenously to the patient over a twelve-hour period. what flow rate should be used in units of ggt/hr? a. the patient should take nothing pills every four hours. (type an integer or decimal rounded to the nearest hundredth as needed.)