V THIS SECTION Q1. A binary operation is defined on the set R, of real numbers by x*y=x+y+8, where x, y ER.
a) Calculate 6 * (85) b) Determine whether or not the operation is i) commutative ii) associative
c) find the identity element of the operation d) find the inverse under 6.​

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.

Write a description of each inequality. 1. -5a + 3 > 1 2. 27 - 2b < -6 (this < has a _ under it) 3. 1/2 (c + 1) > 5 (this > has a _ under it)

Which linear function represents the line given by the point-slope equation y + 1 = –3(x – 5)?