-5x + 5y +5z = -15
x - 4y - 2z = 12
5x + 6y - 3z = -13

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm

there were a lot of them but the first one to pop up on a google search was bts

sorry but i cant draw that

you have 6 equal triangles, find the area of one of them (b*h/2) and multiply by 6

(8*4: 2)*6 =

32 cm² is your answer