the diameter of a tree varies directly at it age. A 20 year old tree is 6 inches in diameter. How old will the tree be when it is 24 inches in diameter."
2006-10-22 01:58:05 · 5 answers · asked by neil h 1 in Science & Mathematics ➔ Mathematics
Set up a proportion : 20/6=x/24
Cross multiply: 6x=480
x=80 years
2006-10-22 02:05:53 · answer #1 · answered by tamana 3 · 1⤊ 0⤋
D=kt
6=k*20
k=3/10 D=.3t t=D/.3 = 8 years
2006-10-22 09:36:52 · answer #2 · answered by rwbblb46 4 · 0⤊ 0⤋
since they are directly related u can set up a proportion as follows.
20 / 6 = x / 24
we cross multiply to get
480 = 6x
divide both sides of the equation by 6. this is to get x by itself on one side of the equation
so x = 80
2006-10-22 09:12:15 · answer #3 · answered by jamnad 1 · 0⤊ 0⤋
80 years old but the atatment that the trees diameter varies directly to it's age is incorrect!
2006-10-22 09:09:40 · answer #4 · answered by grumpyoldman 4 · 0⤊ 0⤋
is this an IF question, because trees grow not just according to species, but the condition to which they find themselves, also the weather conditions at that place. LF
2006-10-22 09:10:00 · answer #5 · answered by lefang 5 · 0⤊ 0⤋