It's 192, I'm pretty sure. I hope that you get this right! :^)
4xAnswer: y=9-4x
Step-by-step explanation: Subtract 4X from both sides
<h2>
Dimension of box is 2 m x 2 m x 1.33 m</h2>
Step-by-step explanation:
Let a be base side and h be the height.
Volume of box, V = a²h
The sides of the box will cost $3 per m² and the base will cost $4 per m². Cost for making is $48.
That is
4a² + 3 x 4 x a x h = 48
4a² + 12 a x h = 48
a² + 3 ah = 12

So volume is

At maximum volume we have derivative is zero,

Negative side is not possible, hence side of square base is 2m.
Substituting in a² + 3 ah = 12
2² + 3 x 2 x h = 12
h = 1.33 m
Dimension of box is 2 m x 2 m x 1.33 m
This is equal to the probability that no light fail. Probability of one light not failing = 0.98.
P(no light fails) = 0.98^20 = 0.67 or 67% to nearest percent.