Barb and Jim each make a number pattern. The first 5 terms in each pattern are shown below. The patterns continue. Barb's pattern: 7, 10, 13, 16, 19
Jim's pattern: 7, 11, 15, 19, 23
Explain why the sum of any term in Barb's pattern and the corresponding term in Jim's pattern will always be a multiple of 7.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Me n o w. i need t h i s. 10 points

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.