Ooo plzzz elps ill give u 40 pty which numbers are necessary to solve this problem?

brian goes to the gym 3 times a week. he exercises for 45 minutes each visit. fifteen of those minutes are spent on weights and the rest are spent on the treadmill.

how much time does brian spend on the treadmill in 4 weeks?

a.
3 times a week, 45 minutes, 15 minutes, 4 weeks

b.
3 times a week, 15 minutes, 4 weeks

c.
3 times a week, 45 minutes, 4 weeks

d.
3 times a week, 15 minutes

i dont know answer:

step-by-step explanation:

i think it is c, not positive though

step-by-step explanation:

45

step-by-step explanation:

to find a percentage, add a decimal in front and multiply it by the other number.

.25 times 180= 45

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