Building a 200 foot-long bridge across Scorpion Gulch, where the water is 8 feet deep, costs $700,000. Assume that the cost vari
es directly with the length of the bridge and directly with the square of the depth of the water.
1 answer:
Step-by-step explanation:
BE SURE TO READ THROUGH.
Represent cost with C, length of bridge with L and depth of water with D.
- & represents directly varies as
; C & L
; C & D²
therefore C & LD²
; C = kLD².......k is a constant
700,000 = k × 200 × 8²
700,000 = k × 200 × 64
700,000 = 12800k
700,000 / 12800 = k
54.6875 = k
The relationship therefore is C = 54.6875 × LD²
What are we then to do??
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