Question

Police use the formula r=2radical 5(L) to approximate the rate of speed in miles per hour of a vehicle from its skid marks, where L is the length of the skid marks in feet.

About how fast is a car going that leaves skid marks of 245ft?
a.40mi/h
b.50 mi/h
c.60mi/h
d.70 mi/h

Answer 1

what is the r?

Answer 2

I think it the rate.

Answer 3

well.... i'll give you a medal for whatever reason. even though you left.

Answer 4

sorry

Answer 5

it okey dokey.

Answer 6

so sub the info in

Answer 7

you get r= 2 sqrt 5 (245)

Answer 8

5 times 245 equals 1225, right? the problem becomes 2radical 1225.

Answer 9

correct

Answer 10

I get that part, but I don't understand how to get the answer for 2radical 1225.

Answer 11

first square 1225

Answer 12

Wait a minute, I need a calculator.

Answer 13

it's. 35

Answer 14

now it's simple, just times by 2 and get d!

Answer 15

You didn't even give me a chance..... but I'll survive what's next.

Answer 16

70 ;)

Answer 17

THANK YOU! Are you a teacher?

Answer 18

noooooooooo I'm just a 10th grader lol

Answer 19

gotta go, bye !

Answer 20

Well this is 9th grade math. I'm in the 7th. So know wonder you're GREAT at it!

Answer 21

Adios!

Answer 22

So........bye?