To find the answer, we multiply these two fractions
2/5 * 3/10
6/50
3/25 of the students live at home
Because the factors in the numerator cancel with the factors in the denominator. Consider this example:

All of the 6's in the denominator canceled with the 6's in the numerator, and only 3 6's "survived". The opposite can also happen, if there are more terms in the denominator:

So, everything is coherent
Answer:
More than 200 items must be produced to keep the average cost below $40 per item.
Step-by-step explanation:
The answer is 23.2 I just entered the data into an online standard deviation calculator.
Answer:
D) 
Step-by-step explanation:
Given: 
Use Exponent Rule: 
Use Addition Rule: 