Assuming that this is a linear relationship you must find the rate of change...$23.81-$20.70= $3.11. 3.11 is how much it changed that year. What that also gives you is how much you bought the post for at 0 years by subtracting $20.70 and the $3.11 = the price of the poster. This gives us the equation y=3.11(x)+17.59
Where Y is the value and X is the amount of years.
Inequality that represents the lengths of the glass:
12 cm < x ≤ 12.2 cm
They are equal fractions that go into each other. for example,
2/4 goes into 4/8
X-16=-8
Add 16 on both sides
x=-8+16
And solve; your answer will be
x=8
