Answer:
1.5 seconds
Step-by-step explanation:
i took a test with the same question
0.32 cents for each unit because if you divide 7.68 by 24 it is 0.32
The percent of increase in sales.
(60-48)/48)*100=25%

this is because when 40 is broken down into two numbers (one divisible to get out of the square root, and one not) you get 25 + 15 under the square root. we know that the square root of 25 is 5, so we can put 5 outside the root and leave 15 inside.
-------------- try the next problem, and if you don't understand, please reply back.
answer is for a) 