The expression below can be used to find the surface area of a cube when given the length of an edge, a.

6a2

what is the surface area of a cube with an edge length that measures 0.5 centimeters?

a = edge length = 0.5 cm

S = surface area of cube

S = 6*a^2

S = 6*(0.5)^2

S = 6*0.25

S = 1.5

You can use cm^2 in place of "square cm" to mean the same thing.

Step-by-step explanation:

Substitute a = 0.5 cm to the formula SA = 6a² :

SA = 6(0.5)² = 6(0.5 · 0.5) = 6(0.25) = 1.5 cm²

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^