Answer:
32'cube
Step-by-step explanation:
Just i have no paper and pen so i just calculated it in my mind so its not practically an accurate answer
9514 1404 393
Answer:
B. (n²+n)/2
Step-by-step explanation:
You only need to try n=2 in the answer choices to determine which one gives a result of 3.
A. (2+1)/2 = 3/2 ≠ 3
B. (2² +2)/2 = 3 . . . . correct choice
C. (2² -2)/2 = 1 ≠ 3
D. (2 -1)/2 = 1/2 ≠ 3
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<em>Additional comment</em>
The differences of the sequence 1, 3, 6, 10, ... are increasing, not constant. This means the rule will not be linear, but will be 2nd degree. (Second differences are constant.) This eliminates choices A and D immediately.
Answer:
Step-by-step explanation:
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Answer: #20, x = 3
#21, x = 1/2
Step-by-step explanation:
#20) x + 4 + x + 2+ x + 5 = x + 3 +x+3+x+1+x+1
3x + 11 = 4x + 8
<u>-3x -3x</u>
11= x + 8
<u> - 8 - 8</u>
3 = x
#21) 12x(5) = 6x + 9 + x + 10 + x + 7
60x =8x + 26
<u> -8x -8x</u>
52x = 26
divide both sides by 52
x = 1/2
Becuase one is .000101 (one hundred one thousandths) and one is not