The "double-r-7" ranch has a new owner. the 20 animals, all hummingbirds and mice, are dismayed, as they have heard that he is both foolish and inexperienced. not being quite sure what he was looking for, however, he checked on the health of his animals by inspecting all their feet. there were 64 feet in all. how many hummingbirds and how many mice are on this ranch?
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When x = 3 and y = 5, by how much does the value of 3x2 – 2y exceed the value of 2x2 – 3y ?

The probability that an adult possesses a credit card is .70. a researcher selects two adults at random. by assuming the independence, the probability that the first adult possesses a credit card and the second adult does not possess a credit card is:

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.