Mark's bank account is currently overdrawn and is -$55. He deposits $80 and then buys a $20 hat. He also wants to buy a new notebook that cost $8. Use a number line to model the situation
and determine if Mark has enough money. If he does, how much is left over. If he doesn't, how
much does he need? Show your work.

answer: 0.1,0.85

step-by-step explanation:

let's call the solutions x₁ = (5 - 2√7)/3 and x₂ = (5 + 2√7)/3

then the equation is (x-x₁)(x-x₂) = 0

if you fill that in you get a lot of numbers which you can recognize as ax²+bx+c=0.

step-by-step explanation:

you can see that a=1 (there is just an x²)

b = (-5 -2√7 + 2√7 - 5)/3 = -10/3

c = -2√7)/3 ) * (-5+2√7)/3) = -1/3

so your answer is 3x^2 – 10x – 1 = 0

can you post the graph?