Solveit

put in term s of x- 2

don t repost the question just write the link to the question and i already answered that question:

2nd button acos

here is full answer by cymath:

http://www.cymath.com/answer.php?q=3x%5E2%3D-33x-90 

$\begin{array}{lcl}3x^2=-33x-90\\ 3x^2+33x+90=0 \text{ (:3)}\\ x^2+11x+30=0\\ (x+6)(x+5)=0\\ x_1=-5\\ x_2=-6 \end{array}$

Through (5,5);parallel to

paralell lines means their slopes are the same

 $y=mx+b$

their m s are the same

$5=5\times5+b\\ b=-20\\ \text{your equation is: }\\ y=5x-20$

y=1

x=4

$-8x-4y=3 \text{ (:4)} \\ -2x-y=12\\ $

$-2x-y=\frac34 \\ -2x-y=12$

they are prallel because their slopes are the same

In the year 1993, the average cost of a radio could be modeled by the equation C = -15t2 + 1000 where t is the number of years since 1993. By the year 2006 the average cost had changed, so it could be modeled by the equation C = -5t2 + 1200. Find the difference in the average costs for a television between 2006 and 1993

I think:

$C_{1993}-C_{2006}=-15\times 0^2+1000-(-5\times 0^2+1200)=-200$

Answer: 200