The speed that a car is going on a dry road when the driver puts on the breaks can be estimated by the equation s=√24d , where d is the distance that the car skids in feet. A car that was in an accident skidded 214 ft. Find the speed, in miles per hour, that a car was going before the accident occurred. Round your answer to the nearest tenth.

Question

anonymous · Answer

I understand this is not your question http://openstudy.com/study#/updates/4ff133a6e4b03c0c488a25e3 but you can go to it and plug your problem into it

anonymous · Answer

okay i will try

phi · Answer

they give you an equation
$$ s = \sqrt{24d} $$
 d is the distance that the car skids
A car skidded 214 ft.

what number should you use for d ?

anonymous · Answer

24 @phi

phi · Answer

A car skidded 214 ft.

how far did the car skid ?

anonymous · Answer

214 @phi

phi · Answer

yes, the car skidded 214 feet.

Next,  d is the distance that the car skids
what number is d ?

anonymous · Answer

d=214

phi · Answer

yes.  now we use that info. in
$$ s = \sqrt{24d} $$
replace d with 214 in that formula.  (that means erase the d and put in 214)
remember that 24d is short for 24 * d  (24 times d)

anonymous · Answer

|dw:1396962581823:dw|

phi · Answer

almost.  
you start with 
$$ \sqrt{24d}$$
replace the "d" with 214.  take the "d" out (gone!) and put in 214 instead (like a substation of a player in a game)

phi · Answer

replace the "d" with 214.  take the "d" out (gone!) and put in 214 instead (like a substitute player  in a game)

anonymous · Answer

$$\sqrt{214} d24$$

phi · Answer

ok but take out the d

anonymous · Answer

$$\sqrt{214}^{24}$$

phi · Answer

yes, but it looks like this
$$ \sqrt{24\cdot 214}$$
the numbers are multiplied (in algebra we don't put in the multiplication sign, but that is what we mean)

now multiply the numbers, then take the square root
can you do that ?

anonymous · Answer

71.6658914687 @phi

phi · Answer

yes.  the last step
 Round your answer to the nearest tenth.

anonymous · Answer

my answer choices are 

A. 6503.6
B. 7523.7
C. 2402.5
D. 2231.4 

so the answe rwould be B

phi · Answer

those must be to a different question.  A car does not go seven thousand miles per hour.

anonymous · Answer

OHH YES YES IT WAS I FOUND IT THANK YOU

phi · Answer

you got
71.6658914687 

 Round your answer to the nearest tenth. 
the "tenths" place is the 6 next to the decimal point
to round, look at the number to its right (the other 6)
if 5 or bigger (and it is), round the tenths place up 1 (to 7)
the final answer is
71.7  rounded to the nearest tenth