The main cable of a suspension bridge forms a parabola, described by the equation y = a(x − h)2 + k. y =height in feet of the cable above the roadway x =horizontal distance in feet from the left bridge support a =a constant (h, k) =vertex of the parbola What is the vertex of the parbola?

28

step-by-step explanation:

8+8+6+6

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

need more detail

step-by-step explanation:

lele

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -