The Pep Club rented a shaved ice machine to sell shaved ice as
a fundraiser. They paid an initial fee and
then an hourly charge. The table shows
the cost per hour. Find and interpret the
rate of change and initial value. Assume
the relationship between the two
quantities is linear.

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

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

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b