11. The height of a soccer ball above the ground, y, in metres, is modelled by the function y= 4.9x + 5x + 1, where x is the time in seconds after the ball is kicked.
a) Use technology to graph, then draw sketch of the graph.
b) Use technology to determine the maximum height the ball will reach. Round your answer to the nearest
tenth of a metre.
c) State any restrictions on the domain and range of the function.
d) For how long is the ball in the air?
(4 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.