2007-06-03 11:57:21 · 5 answers · asked by cheez-it 1 in Science & Mathematics ➔ Mathematics
Do a proportion
5/7 = x/20
7x = 100
x = 14.3 ft
.
2007-06-03 12:01:08 · answer #1 · answered by Robert L 7 · 0⤊ 0⤋
The tree is 20 * 5 / 7 = 100 / 7 = 14 2/7 ft. tall.
2007-06-03 19:01:16 · answer #2 · answered by Anonymous · 0⤊ 0⤋
If you are 5 feet tall and cast a seven-foot shadow, the formula is the shadow extends five-sevenths.
The tree shadow is twenty feet. Divide that by seven. Now multiply your answer by five. The tree is 14 and two-sevenths feet tall.
2007-06-03 19:02:47 · answer #3 · answered by Your Uncle Dodge! 7 · 0⤊ 0⤋
use cross multiplication
5/ 7 = x/20
7x=100
100/7= 14.2857
rounded x=14
The tree is 14 ft. tall
2007-06-03 19:03:57 · answer #4 · answered by dominiquensemedo 2 · 0⤊ 0⤋
5/7=x/20
x=20(5/7)=100/7=14.286 ft
2007-06-03 19:00:38 · answer #5 · answered by llllarry1 5 · 0⤊ 0⤋