Hello :D
So we need to work out 5% and subtract it from the total price.
10% = $2 (Divide 20 by 10)
5% = $1 (Divide 10% by 2)
$20 - $1 = $ 19
The only increasing function is the last option:

<h3>
Which function is increasing?</h3>
Here we only need to see that, is as x increases also do f(x). Then the function will be increasing.
The cases for exponential functions is actually more trivial than that.
- If the base is between zero and 1, then the function is decreasing.
- If the base is larger than 1, then the function is increasing.
In the given options there is only one function with a base larger than 1, which is the last option:

That is the correct option.
If you want to learn more about exponential functions:
brainly.com/question/11464095
#SPJ1
18% of 4,500 is 810
4,500x0.18=810
Therefore, 18% of $4,500.00 is $810.00
Answer:
3
Step-by-step explanation:
8 times -5 = -40