Questions on Algebra: Expressions involving variables, substitution answered by real tutors!

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Question 170462This question is from textbook Introductory Algebra
: Using the formula r = 2sqrt (5L), how far will a car skid at 55 mph? at 90 mph?This question is from textbook Introductory Algebra
: Using the formula r = 2sqrt (5L), how far will a car skid at 55 mph? at 90 mph?
Answer by Mathtut(1309) About Me  (Show Source):
You can put this solution on YOUR website!
r=55
:
55=2sqrt(5L)--->square both sides
55^2=4(5L)
3025=20L
highlight(L=151.25)length of skid
:
r=90
:
90=2sqrt(5L)--->square both sides
90^2=4(5L)
8100=20L
highlight(L=405) length of skid