Sorry but..I don't even know where to start. Good luck!
The only correct answer is NE because it is the reverse to EN.
Answer:
<u>n = 30</u>
Step-by-step explanation:
5n = Mean of three numbers
391 = 1st number
n = 2nd number
n - 1 = 3rd number
Therefore, to solve for x, we can write this equation:
(391 + n + n - 1)/3 = 5n
391 + 2n - 1 = 15n (Lowest Common Denominator is 3)
2n - 15n = -390 (Like terms)
-13n = -390
n = -390/-13
<u>n = 30</u>
Proof of n= 30 is correct:
(391 + n + n - 1)/3 = 5n
(391 + 30 + 29)/3 = 5 * 30
450/3 = 150
150 = 150
We proved n = 30 is correct
Answer:
528
Step-by-step explanation:
Surface area of bottom block + Surface area of top block - 2(Shared surface area)
Bottom block: 2(10*12) + 2(5*12) + 2(5*10) = 240 + 120 + 100 = 460 square inches
Top block: 2(2*2) + 4(2*8) = 8 + 64 = 72 square inches
Shared surface area = 2*2 = 4 square inches
Plugging into our formula:
460 + 72 - 4 = 528 square inches
