The opening of a tunnel that travels through a mountainside can be modeled by y = - \frac {2}{15} (x - 15)(x + 15)y=−152(x−15)(x+15) , where x and y are measured in feet. The x-axis represents the ground. a. Find the width of the tunnel at ground level.
b. How tall is the tunnel?

ian gonna lie that is way to much

i think the answer is seven, for if i'm being useless °ω°

step-by-step explanation:

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!

the rocket cannot penetrate the ground, in a contextual sense, therefore the roots of this equation should be the domain of this function. i'll let you find the roots of this quadratic equation (hint: use the quadratic formula:  

1- c

2-a

step-by-step explanation:

mark brainliest!