Question

LAW ENFORCEMENT: A police accident investigator can use the formula S=2√5L to estimate the speed s of a car in miles per hour based on the length l in feet of the skid marks it left. How fast was a car traveling that left skid marks 129 feet long?

Round your answer to the nearest miles per hour

Answer 1

ok, so here you have another function to evaluate, it's just called s, and s = \[2\sqrt{5L}\]

Answer 2

so this evaluates the speed, given the length of the skid marks when the car started to brake, so basically evaluate s when L=129 feet in this case

Answer 3

\[s = 2\sqrt{5(129)}\] plug in the value of L

Answer 4

what do you get?

Answer 5

do i simplify it

Answer 6

yes, you can use a calculator

Answer 7

5 times 129 = 645

Answer 8

thats what i got

Answer 9

when i do it

Answer 10

done

Answer 11

now \[\sqrt{645}\] yields 25.3968

Answer 12

yep

Answer 13

and 2(25.3968) = 50.7937

Answer 14

but the problem says round to the nearest mile per hour, so you can say that the car was traveling at 51 miles per hour

Answer 15

did my answer just get deleted? lol

Answer 16

im doing a review for my exam
and nope lol

Answer 17

oops it just didn't refresh haha i see it now

Answer 18

yeah, that was like the previous problems you've done but this time around is just a word problem, make sure you read it and identify the given values so you can compute the function easily

Answer 19

im just not good with word problems

Answer 20

tbh

Answer 21

they can be tricky at times

Answer 22

thank you again