Given: bobby and kina together hit at least 30 home runs. bobby hit 18 home runs.
prove: kina hit at least 12 home runs.
assume that kina hit a._ than 12 home runs. this assumption means that bobby and kina combined to hit
at most b._ home runs. that number contradicts the given information that c. so, the assumption
is false. therefore, kina d.

the probability that a bird is green (.30) is true

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