Describe a situation you’re familiar with where one quantity changes constantly in relation to another
1 answer:
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A perfect square must be hidden within all of those radicands in order to simplify them down to what the answer is. 
. 
. 
. The rules for adding radicals is that the index has to be the same (all of our indexes are 2 since we have square roots), and the radicands have to be the same. In other words, we cannot add the square root of 4 to the square root of 5. They either both have to be 4 or they both have to be 5. So here's what we have thus far: 
. We can add 
and 
to get 
. That means as far as our answer goes, A = 72 and B = 4, or (72, 4), choice a.
Answer:
75.5
Step-by-step explanation:
To calculate the mean we use
mean =
To calculate the mean for class B we require their score
Using the mean for class A
= 67.8 ( multiply both sides by 25 )
score = 67.8 × 25 = 1695
Similarly using the mean for all 55 students
= 72 ( multiply both sides by 55 )
total score = 72 × 55 = 3960
Hence score for class B = 3960 - 1695 = 2265
mean for class B = = 75.5