a circular pond with a radius of 1.5 metres has a 20-inch border around it. what os the area of the border

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

Math it's appreciated. (picture provided)

Adecibel is a logarithmic unit that can be used to measure the intensity of a sound. the function y = 10logx gives the intensity of a sound in decibels, where x is the ratio of the intensity of the sound to a reference intensity. the reference intensity is generally set at the threshold of hearing. use the graphing utility to graph the decibel function.a whisper has a sound intensity of 30 decibels. use your graph to you complete the following statement. the sound intensity of a whisper is times the reference intensity.