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 equation is y = -3x.

The function is linear.

The point (2, -6) is on the graph of the function.

Step-by-step explanation:

The function is linear.

direct variation function is always linear. and linear means a straight line which is true in this case

The equation is y = -3x.

equation of line is y=mx+c

where, m=slope= -3.

it is linear so we are assuming it passes origin, (0,0).

m=(y2-y1)/(x2-x1)

now substituting m=-3 and (0,0) in x1 and y1.

-3=(y2-0)/(x2-0)

-3=y2/x2

y2=-3*x2

where y2=y, x2=x,

therefore,

y=-3x.

The point (2, -6) is on the graph of the function.

now,

y=-3x

substituting x=2,

y=-3(2)

y=-6

therefore,

if x=2, y=-6, (2,-6)