Answer:
<h2>x = 9</h2>
Step-by-step explanation:

The perimeter is calculated by adding the lengths of all the sides together, or by using the form P = 2l + 2w
Here, that would be:
P = 2(5) + 2(4)
P = 10 + 8
P = 18
Answer:
P = 18 cm
Hope this helps.
Answer:
x = h = ∛7 cm ≈ 1.913 cm
Step-by-step explanation:
The volume and other dimensions are related by ...
V = Bh = x²h
Solving for h gives ...
h = V/(x²)
The surface area is ...
S = 2(x² +h(2x)) = 2x² +4x(V/(x²)) = 2x² +4V/x
Differentiating with respect to x, we can find where the derivative is zero.
S' = 4x -4v/(x²) = 0
x³ -V = 0 . . . . . . . multiply by x²/4
x = ∛V . . . . . . . . . solve for x
h = V/(∛V)² = (∛V)³/(∛V)² = ∛V
The surface area is minimized when the box is a cube. Its edge lengths are all (∛7) cm ≈ 1.913 cm.
The slope of the given line is -4/5. The line perpendicular to that line will have a slope that is the opposite reciprocal. In other words, the perpendicular slope will be 5/4. If it passes through (4, 12), we have an x and a y value to use in y=mx+b. y is 12, x is 4, and we have a slope of 5/4. Filling in accordingly:

and 12 = 5 + b. So b = 7. Rewriting with our new slope and b value,

. And there you go!
all three angles are the same
so it could be n squared or 3n+18