a bag of 100 blue and purple marbles has three times as many blue marbles as purple marbles. if purple marbles are added to the bag until the number of purple marbles in the bag is double the original amount, what is the probability of taking out a blue marble and then choosing another blue marble?

60 2(x + 2) in the diagram, gef and hef are congruent. what is the value of x?

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.

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers