So... hmmm if you check the first picture below, for 2)
we could use the proportions of those small, medium and large similar triangles like

now.. for 3) will be the second picture below
Answer:

Step-by-step explanation:
Given data
P= 45,000
rate= 18%
Recall the expression for the compound interest

Since we are talking of depreciation

Substitute

Hence the exponential function is

Answer:
3x² + 8x - 9
Step-by-step explanation:
8x² - 5x² +x+7x-10+1
=3x² + 8x - 9
Difference
1 2 3 4 5 ... n
difference is 1