The 1st layer has 1 cubes, which is also 1²,
the 2nd layer has 4 cubes, which is 2²
the 3rd layer has 9, which is 3²
the nth layer has n² cubes
Answer:
D. 84 square feet
Step-by-step explanation:
Hope this helps and have a nice day
Answer: x=6
Step-by-step explanation:
1) add 1/8 to both sides
2) divide both sides by 1/4
3) 1.5/.25= 6
Answer:
55
Step-by-step explanation:
62+63=125
180-125=55
This is the sum of the arithmetic sequence:
10 - 2 + 6 + 14 + ... + 110
where: a 1 = - 10, d = 8
a n = 110
a n = a 1 + ( n - 1 ) * d
110 = - 10 + ( n - 1 ) * 8
110 = - 10 + 8 n - 8
110 + 10 + 8 = 8 n
128 = 8 n
n = 128 : 8
n = 16
∑ n = n/2 * ( a 1 + a n )
∑ 16 = 16/2 * ( -10 + 110 ) = 8 * 100 = 800
Answer:
The sum is 800.
