Answer:
5
Step-by-step explanation:
We are given the geometric series:
-1, - 2, - 4, - 8.......
In the geometric series above, the common ratio = second term/first term = -2/-1
= 2
Where common ratio is greater than 1(r >1)
The sum of a geometric progression =
Sn = a(rⁿ -1)/r - 1
In the question we are asked to find the number of term = n
Sn = -31
a = -1
r = 2
Hence,
-31 = -1(2ⁿ - 1)/2 - 1
-31 = -1(2ⁿ - 1)
-31 = -2ⁿ + 1
2ⁿ = 1 + 31
2ⁿ = 32
2ⁿ = 2^5
n = 5
Therefore, the number of terms(n) = 5
Answer:
Step-by-step explanation:
<u>Use this formula for interest:</u>
- I = Ptr, where I - interest, P- principal, t- time, r - interest rate
<u>Substitute values and solve for r:</u>
- 18 = 150*6*r
- r = 18/900
- r = 2/100
- r = 2 %
Answer:
About 39,402.
Step-by-step explanation:
You need to find the 46% of black cars.
The answer is true, because there is only one number that can be squared to twelve.
