Answer:

Step-by-step explanation:
Given


Required
Determine the percentage that do not receive treatment
This is calculates as:




<em>Hence: 25% of the volunteers do not receive any treatment</em>
Answer:
Step-by-step explanation:I think it would be 10
Step-by-step explanation:
Adding 3 to both sides, we get
Dividing both sides by 2, we get
When you multiply two numbers with the same base, their exponents add up.
3/7 + 1/4 = 12/28 + 7/28 = 19/28
It would be 2^19/28