The endurance of both track athletes and gymnasts is recorded in terms of maximum volume of oxygen and is measured in milliliters per kilogram of body weight per minute.

track athletes gymnasts
89.2 72.1
45.3 78.5
89.1 66.2
57.3 47.3
61.5 63.1
80.1 89.3
47.2 65.3

what is the difference of means, rounded to the nearest hundredth, for the two groups?

a. dx = 1.73
b. dx = 1.69
c. dx = 67.1
d. dx = 68.7

the answer to your question is c.)   volcanoes built the mountains and earthquakes tore them down.

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