1. ## Functions!

The second span of the bluewater Bridge in Sarnia, Ontario is supported by two possible arches. Each arch is set in concrete foundations that are on opposite sides of the st. clair river. The feet of the arches are 281 . apart. The top of each arch rises 71m above the river. Write a function to model the arch.

2. ## Re: Functions!

The roots are 0 and 281, so the middle of the parabola or the aos is 140.5. The vertex will be at (140.5,71)

So,

f(x)=a(x)(x-281)
sub in the vertex and solve for a.

71=a(140.5)(140.5-281)
a= -284/78961

There fore, the function is f(x)= -284/78961 (x)(x-281)

3. ## Re: Functions!

Thankyou so much !

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