Question

18 = 1/2k3^2

another question- Formula for the surface area of a rectangular prism:SA=2(lw+hw+hl) for h

Answer 1

18=1/2×k×3²

18=k/2×9

18/9=k/2

2×2=k

k=4

SA=2(lw+hw+hl)

SA/2=lw+hw+hl

SA/2-lw-hw=hl

h=SA/2 -w(l+h)/l