Janice has test scores 96, 84, 88, and 94. her score for homework is 100 and is weighted as a test grade. she still needs to take the final exam. what score does she need on the final exam to average atleast a 90.

Janice needs at least a 78 on the final exam

If x was 78, average is 90.

If x was 77, average would be an 89.83

sadsdda

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