Posted by **HELLO** on Friday, January 4, 2013 at 7:21pm.

A forest is burning in a valley. If the fire burns for h hours, the cost of the lost timber is 1000h dollars. They estimate that x firefighters can stop the fire in 3600/x hours. The cost for each firefighter is $20 (transportation)plus $25 per hour (salary/ food).

A. Let C be the cost of the fire. C will depend on both h and x . Give a formula for C in terms of x and h.

B. Give a formula that relates x and h.

C. How may firefighters should be used if the cost C of the fire is to be minimized?

- calculus -
**Steve**, Saturday, January 5, 2013 at 3:35pm
so, given x firefighters,

h = 3600/x

C(h,x) = 1000h + 20x + 25hx

so,

C(x) = 1000(3600/x) + 20x + 25(3600/x)x

= 3600000/x + 20x + 25*3600

dC/dx = -3600000/x^2 + 20

= 20(1-180000/x^2)

dC/dx=0 when x^2 = 180000

x = 424

since C" > 0, it's a minimum.

## Answer this Question

## Related Questions

- calculus - A forest is burning in a valley. it is estimated that if the fire ...
- calculus - A forest is burning in a valley. it is estimated that if the fire ...
- Statistics - A forest fire is burning down a narrow valley 3 miles wide at a ...
- statistics - A forest fire is burning down a narrow valley 3 miles wide at a ...
- Statistics - A forest fire is burning down a narrow valley 3 miles wide at a ...
- Decision modeling - A forest fire is buring down a narrow valley 3 miles wide at...
- Math - two forest fire stations,P and Q are 20.0 km apart, A ranger at station Q...
- analytic geometry - A forest ranger in a 120ft observation tower sees a fire. ...
- math - A fire covers 420 acres and continues to spread at a rate of 60 acres per...
- algebra - if the damage caused by forest fire A is measured in shape of a ...

More Related Questions