Answer:
1. 10dm by 8 dm
2. own answer na po yan
Step-by-step explanation:
1. let a and b be the sides of the rectangular metal plate
2(a+b)=36
a+b=18
a=18-b, this will be eq. 1
ab=80, substitute eq. 1 to a
(18-b)b=80
18b-b²=80
b²-18b+80=0
(b-10)(b-8)=0
b-10=0, b-8=0
b=10, b=8
either solution is good
if b=10, then a=18-b=18-10=8 dm
if b=8, then a=18-b=18-8=10 dm
