Alex completes the 70km journey between london and reading in 54 minutes. She then drives 42km from reading to oxford at an average speed of 70km/h work out averages average speed in km/h for her total journey from London to oxford

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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.

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?

Multiply and simplify. 2x2y3z2 · 4xy4x2 how to do?