Value of x? Complementary angles, easy.

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

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 sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.