It should be $615.45 , I just subtracted the amount by 5%
Thanks with all of my heart!
ik im not first but have a lovely day! u are really kind! never forget that!
Answer is 9
A(x)=f(b)-f(a)/b-a
where a=-10 b=10
f(x)= x^2+9x+18
f(a)=(-10)^2-90+18=28
f(b)=208
A(x)=208-28/10+10
A(x)=180/20=9
