Answer:
n(n+1)
Step-by-step explanation:
Only the last two formulas work for n=1; only the last formula works for n=2.
<u>For n=1</u>
3n = 3 ≠ 2
n² -1 = 0 ≠ 2
n² +1 = 2
n(n+1) = 2
<u>For n=2</u>
n²+1 = 5 ≠ 6
n(n+1) = 6 . . . . . this last formula works for the given sequence
Answer:
20 min
Step-by-step explanation:
5 is 1/3 of 15
That means that the time is 1/3 of a hour which is 20 min
Answer:
see explanation
Step-by-step explanation:
The surface area (A) of a sphere is calculated as
A = 4πr² ← r is the radius, here r = 9, thus
A = 4π × 9² = 4π × 81 = 324π ≈ 1017.9 units²
Answer: I think best answer for this equation is A
Step-by-step explanation:but just to be exactly sure I suggest using homeworkla .org just to be sure, but I'm positive it's A.
hope this helps :3
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