Answer: A
48+ 36 = 84
84/4 = 21 groups
there are 21 groups of 4 balloons
He drives 75 1/3 miles in 60 mins
8 3/4 hours is 525 mins
75 1/3 divided by 60 is 1 1/4 miles per minute
1 1/4 x 525 mins = 659.16666667 miles
<span>Let p be the probability that an adult was never in a museum. Hence p = 0.15. Then q is the probability that an adult was in a museum is 1 - 0.15 = 0.75. We have a binomial expansion where the probability of k success in n trials is given by
P_n(k) = (n, k) p^(k) q^(n -k) where (n, k) is the number of ways to select 10 objects from k things.
At least two or fewer means we have P_10 (< or equal to 2)
So we have P_10 (less than or equal to 2) = P_10 ( 0) + P_10 (1) + P_10 (2).
So we have P _10 (0) = ( 10, 0) (0.15)^ (0) (0.75)^(0) = 0.196. For P_10(1), we have 0.3474 and for P_10(2), we have 0.2758. Adding these we have 0.1960 + 0.3474 + 0.2758 = 0.8192.</span>
Given:
The expression is

To find:
The simplified form of the given expression so there is only one positive power for the baser -5.
Solution:
We have,


Using the properties of exponents, the given expression can be written as
![[\because \dfrac{a^m}{a^n}=a^{m-n}]](https://tex.z-dn.net/?f=%5B%5Cbecause%20%5Cdfrac%7Ba%5Em%7D%7Ba%5En%7D%3Da%5E%7Bm-n%7D%5D)

Here, the base is -5 and the exponent is 5.
Therefore, the correct option is C.