A=7 and b= anything other than 4. The reason for this is because the lines must never touch (equal slope with different y intercept provides a parallel line that does not meet the original function). A solution is a point in which the two functions intersect. The other answer under this post is incorrect, as they have actually given you INFINITE solutions rather than none.
The formula is A=p (1+r/k)^kt A future value? P present value 240 R interest rate 0.09 K compounded monthly 12 T time 14 years A=240×(1+0.09÷12)^(12×14) A=842.13
