Answer:
The required equation is
.
Step-by-step explanation:
Consider the provided information.
The Initial value of poster = $ 18
After 1 year amount of increase = $ 20.70
With the rate of 15% = 0.15
Let future value is y and the number of years be x.

Now verify this by substituting x=1 in above equation.

Which is true.
Hence, the required equation is
.
I agree. There can't ever be 2 equal signs in A math problem
The base is an equilateral triangle. The formula of the area of that triangle is:

a - length of side
a = 3". Substitute:

The lateral side is a rectangle.

The Total Area is equal the sum of two times of Base and three times of Lateral Side.
