Fyi area=pir^2 not 3r2
(oh, I see, you want to aprox pi=3, ok)
radius=4
3(4^2)=area
3(16)=area
48=area
answer is 48in^2
Given:
year 0 - 2005 : 90,000
year 1 - 2006 : 91,200
91,200 - 90,000 = 1,200
1,200 / 90,000 = 0.013
90,000 (1+0.013)^1 ⇒ 90,000 (1.013)^1 = 91,170 OR 91,200
The best representation of the relationship between x and f(x) is choice 2.
f(x) = 90(1.013)x
To find how much was spent on fresh flowers, we just multiply 9% to the monthly budget, which is $18,000.
To multiply a percent to a number, we must first turn the percent into a decimal. Just divide the percent by 100 to get the decimal form. 9% is 0.09.

$1620 was spent on fresh flowers (that's quite a lot of money!)
The point of intersection you are concerned with is the left-most of those of the graphed lines. Thus you want the two equatons that both have x-intercepts that are negative. Since the x-coefficient is positive in every case, this will mean the right-side constants of these equations both need to be negative. The appropriate choice is ...
A. 4x - 5y = -5 and 3x + 10y = -20