So, it's only x - 3 = 13, or x = 16! Hope it helps
On 2 the equation will be 5,750-500x when you graph that on the y-axis put go up 5,750 and over 0 from tag point go down 500 and to the right 1.. And on b it will be 3,500-250x on the y-axis go up 3,500 and over 0 from that point go down 250 and over to the right 1..
15c^7d^6+26c^4d^6+15c^4d^2g
Given a quadratic equation

you can find its solutions with the following formula:

You equation is identified by the coefficients

Which means the solutions are

So, the answers are B and D