Solveit

Yes you are right thanks CPhill ! :)

I understood the general idea

Yes i wanted to say exactly the opposite but i mixed them supid me :/

Thanks Geno ! :)

yes D is need to be answer

Thank you Geno3141 ! :)

\(2\sqrt{3}-\sqrt{3}=\sqrt{3}\quad\left(\mathrm{Decimal:\quad}\:1.73205\right)\)

\(C=d\pi\\ C=16\pi\\ 16\pi\times5=80\pi\)

\(A_{circle}=\pi r^2\\ A_{circle}=\pi \times25^2=625 \pi=1963.495408\dots\)

Answer:1963.5

y intrercept is b which is -2   (0,-2)

so lets put x intercept (7,0) to find m (slope) of the function

\(\begin{array}{lcl} y &=&mx-2 \\ 0 &=&7m-2 \\ m&=&\frac72 \\ \end{array}\)

So our equation is:

\(y=\frac72x-2\)

\(f(x)=4x^2+4x+4 \\ f(2)=4\times2^2+4\times2+4\)

Solve that and you will get answer