Answer:
None of the pairs of expressions are equal
Step-by-step explanation:
• 2n ≠ 2 +n
2n is the same as 2 times of n (expressed as a multiplication sign), while 2 +n is the addition of 2 to n.
•n² ≠ 2n
n²= n ×n
2n= 2 ×n
• 2n² ≠ (2n)²
Note that in the latter, there is a bracket which means that the square applies to both 2 and n.
(2n)²
= (2)² × n²
= (2 ×2)(n²)
= 4n²
Thus, none of the pairs of expressions are equal.
Total surface area of a cone is given by,
Surface area of the cone = πrl + B
Here, l = Slant height of the cone
r = radius of the circular base
B = Area of the base
From the picture attached,
Slant height 'l' = 15 in.
Radius of the circular base 'r' = 12 in.
Area of the circular base = πr²
= π(12)²
= 144π in²
By substituting these values in the expression of the surface are,
Total surface area of the cone = π(12)(15) + 144π
= 180π + 144π
= 324π in²
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15 dollars
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Answer:
C.
Step-by-step explanation:
There's no problem for now but it still needs to be monitored in case something might happen.