Remember
a²-b²=(a-b)(a+b)
8x²-50y²
2(4x²-25y²)
(2)([2x]²-[5y]²)
2(2x-5y)(2x+5y)
Answer:
B. 0.835
Step-by-step explanation:
We can use the z-scores and the standard normal distribution to calculate this probability.
We have a normal distribution for the portfolio return, with mean 13.2 and standard deviation 18.9.
We have to calculate the probability that the portfolio's return in any given year is between -43.5 and 32.1.
Then, the z-scores for X=-43.5 and 32.1 are:

Then, the probability that the portfolio's return in any given year is between -43.5 and 32.1 is:

The answer to this question would be: D.99,400 * (0.87)^t < 12,000; 16 days
In this question, the initial number of leaves is 99,400 and it will decrease by 13% each day. Decrease by 13% can be put become: 100%-13%=87% of the original number.
Then, the function for the number of the leaves should be:
99,400 * (0.87)^t
to find how many days after autumn that the tree leaves is less than 12,000 the calculation should be:
99,400* (0.87)^t <12,000
(0.87)^t< 0.1207
The smallest number would be (0.87)^16= 0.10772290133
Answer:
7
Step-by-step explanation:
5×0.4 = 2
2 + 5 = 7