Answer:
or 
Step-by-step explanation:
we know that
The surface area of a cube is equal to
where
x is the length side of a cube
In this problem we have
substitute in the formula and solve for x
square root both sides
112
84 times 4/3= 336/3=112
<span>4172 books will have the same cost
</span>
Answer:
<h2>S.A. = 62</h2>
Step-by-step explanation:
We have:
two rectangles 2 × 3
two rectangles 3 × 5
two rectangles 2 × 5
Calculate the areas:
A₁ = (2)(3) = 6
A₂ = (3)(5) = 15
A₃ = (2)(5) = 10
The Surface Area:
S.A. = 2A₁ + 2A₂ + 2A₃
S.A. = (2)(6) + (2)(15) + (2)(10) = 12 + 30 + 20 = 62
