Answer:
surface area of rectangular prisms A=2(wl+hl+hw)
surface area of cubes A=
Step-by-step explanation:
Your answer would be -16.
Remember, you take 1/2 of b and square it to get c
c=100
(b/2)^2=c
(b/2)^2=100
sqrt oth sides
b/2=+/-10
times both sides by 2
b=+/-20
it is 20 or -20
answe ris B
yo is right