Answer:

Step-by-step explanation:
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1) Exponential functions are given in this form:
For these questions let's focus on these two topics:
If x>0 then they are increasing, if x<0 then they are decreasing ones.
If the base is negative, a<0 then the graph will be traced below the x-axis.
Check the each and their corresponding function based on these pieces of information.
2) Check them below
Answer:
c = 4x + 35
Step-by-step explanation:
Imagine c = cost
$35 is base price so you add that to whatever else you spend.
Let x = number of channels you buy. ($4/CHANNEL)
so cost is equal to $4*channels plus 35
Therefore
c = 4x+35
Answer:
a. y = 4,200
b. 9.2%
Step-by-step explanation:
Given the information:
- The intinital value: 4,200
- The population is decreasing at a rate of 2.4% per year
=> the base number of the exponential function is:
100% - 2.4% = 97.6% = 0.976
Let t is quarter
Let y is the population
=> the following shows an exponential decay function to find the quarterly decay rate is:
y (t)= 4,200
b. The population is decreasing by how much percent per quarter?
Let t = 0 we have: y(0) = 4,200
Let t = 1 we have: y(1) = 4,200
=> the decreasing percentage is:
= (y(0) - y(1)) / y(0)*100%
= (4200 - 3811) / 4200 *100%
= 389/4200*100%
= 9.2%