Answer:
The answer is B
Step-by-step explanation:
3 to the forth power = 81
3 to the second power = 9
81/9 = 9
Answer:
20
Step-by-step explanation:
Sn = (n/2)(a1 + a1 + d(n-1)), where S = sum, a1 = first term, n = number of terms, d = common difference
400 = (n/2)(1 + 1 + 2(n - 1))
400 = (n/2)(2 + 2n - 2)
400 = (n/2)(2n
400 = n2
20 = n
Twenty numbers are in the set.
Because rectangles' sides are equal two by two. they are not all congruent
so the shape is a square
Answer: change over time
Explanation: it is decreasing in height therefore is decreasing in altitude