A number increased by 100% and decreased by 20% is x. what is the number ? NEEDED TODAY
2 answers:
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Answer:
4950
Step-by-step explanation:
The smallest number when rounded to the nearest 100 that becomes 5000 should be between the range of 4950 and 4999.
To the round any figure to the nearest hundred, the of the number should be considered. If the number ranges from 1 to 49, it should be rounded to previous hundred, but if the number is between the range of 50 to 99, it should be rounded to the next 100.
Therefore the smallest number when rounded to the nearest 100 that becomes 5000 is 4950
Answer:
Your sum = - 1
S = ( (-2)^n - 1), If you let n = z, then S = (-2)^z - 1
Step-by-step explanation:
I can use a formula to find the sum of the first n terms.
we have -3, 6, -12, 24, ... etc.
common ratio = r = -2
first term = -3
a_1 = -3
Then: a_n = a_1 * r ^(n -1)
a_n = (-3) * (-2)^(n - 1) is the general formula for the nth term
Sum of first n terms = S = a_1 * (r^n - 1) / (r - 1)
so...
S = (-3) * ((-2)^n - 1 )/ (-2 - 1)
which simplifies to
S = (-3) *((-2)^n - 1) / (-3)
S = ( (-2)^n - 1)
If you let n = z, then S = (-2)^z - 1