The most common type of fluoride found in toothpaste is part of the compound sodium fluoride which has the chemical formula NaF
The random molecular movement from higher concentration to lower concentration
Answer: He spends 29.17 hours per week
Explanation:
1 class = 50mins
7 classes = 7 x 50mins = 350mins
For 5 days in a week, we have
5 x 350mins = 1750mins
Converting to hours, we have
1750 /60 = 29.17 hours
Answer is D
Balance the equation
