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=square root of 24*d, where d is the distance that the car skids in feet. A car that was in an accident skidded 169 ft. Find the speed, in miles per hour, that a car was going before the accident occurred. Round your answer to the nearest tenth.

a. 63.7mph
b. 69.3mph
c. 55.2mph
d. 74.6mph

Question

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=square root of 24*d, where d is the distance that the car skids in feet. A car that was in an accident skidded 169 ft. Find the speed, in miles per hour, that a car was going before the accident occurred. Round your answer to the nearest tenth. 

    a. 63.7mph 
    b. 69.3mph 
    c. 55.2mph 
    d. 74.6mph

lgbasallote · Answer

this question is very familiar...were you the one who asked it a few days ago?

anonymous · Answer

no i just started taking summer school friday so i can move up to 10th grade and they gave us this stupi review pellet to do lol

lgbasallote · Answer

i see...okay

anonymous · Answer

*paper

lgbasallote · Answer

hahaha lol

lgbasallote · Answer

so it says $$\large s = \sqrt{24d}$$
where s is speed and d is distance

the question is asking for the speed when d = 169 so just substitute
$$\large s = \sqrt{24(169)}$$
got it?

anonymous · Answer

so i times the sq rt of 24 by 169 ? cause i did that and didnt get a right answer. i also did sq rt of 24 times sq rt of 169 and still didnt get a right answer /:

lgbasallote · Answer

really? what answer did you get??

anonymous · Answer

first i got 783.836717690617. & then i got 4.898979485566356

lgbasallote · Answer

okay...i do not know how you got these..try multiplying 24 x 169 first...what do you get?

anonymous · Answer

that worked. i got the answer.

lgbasallote · Answer

nice :)