A rounded figure whose boundary is mad of points equidistant from its center.
The formula I like to use is
A = 2(LW + H(L+W))
For your dimensions, this is
A = 2((5 cm)(5 cm) + (12 cm)(5 cm + 5 cm))
A = 2(25 cm² + 120 cm²)
A = 290 cm²
The surface area of your right rectangular prism is 290 cm².
The hypotenuse is square root of 50
The correct option is C = 7 + 2n.
From the question given above, we are told that, a notebook costs $7 and divider cost $2 per kg.
So if you buy one notebook, it will cost $7 and
if you buy n packages of dividers, it will cost $2 * n = 2n.
If you add all the costs of the items together, you will have
Cost [C] = 7 + 2n.
