Question

http://ce.byu.edu/courses/hs/GEOM-041-101/public/start.htm

i need help with number 4

Answer 1

byu independent studies eh .... there is no #4 on that link

Answer 2

yea i know ugh heres the question in ∆ABC if BC is one inch longer AB, AC is 10 inches shorter than the sum of BC and and AB and the perimeter of ∆ABC is 72 inches find the length of BC

Answer 3

just a matter of keeping the lengths in order.

BC = AB + 1
AC = AB + BC -10

AB + BC + AC = 72 ; now get them speaking all the same variable

AB = AB

BC = AB+1

AC = AB + BC -10
= AB + (AB+1) -10

AB + (AB+1) + (AB+AB+1-10) = 72; solve for AB and you should be able to get your results

Answer 4

AB+AB+1+AB+AB+1-10 = 72

(AB+AB+AB+AB)+1+1-10 = 72

4(AB)-8 = 72

4(AB) = 80

AB = 20

Answer 5

since BC = AB + 1; and we know AC = 20 ... id guess BC = 21 :)

Answer 6

typoed meself ... good answer, bad form lol

Answer 7

its fine thanks :)

Answer 8

BC=21 inches