2. length= 2*(3 1/4 width) = 2* (13/4 width) = 13/2 width
then
length = 13/2 width ----(1)
perimeter = 2 width + 2 length = 60 -----(2)
place value from (1) into (2)
2 width + 2 (13/2 width) = 60
2 width + 13 width = 60
15 width = 60
then width = 60/15 = 4
from (1) length = 13/2 (4) = 26
then the width equals 4 centrimeters and the length equals 26 centrimeters.
3. equilateral triangle has 3 equal sides and the perimeter equal 3 sides.
1 side= 10+7h inches
then 3 side = 3(10+7h)=30+21h = 72 inches
so
30+21h = 72
21h= 72-30
21h = 42
then h = 42/21= 2
