Answer:
The product of (a+b)(a-b) is 
Step-by-step explanation:
Use FOIL to explain how to find the product of (a + b)(a − b)
FOIL is
Multiply First terms : a*a = a^2
Multiply Outside terms : a* -b = -ab
Multiply Inner terms : b * a= ab
Multiply last terms : b * -b = -b^2
now we combine all the terms

combine like terms

The product of (a+b)(a-b) is 
Shortcut is we apply an identity

Let hours = x
She can work a maximum of 30 hours so x can be any number from 30 or below.
The inequality would be: X <= 30
You would use the number 1.4 and multiply it by the number you are trying to increase.
Answer:
b) 16 minutes
Step-by-step explanation:
total travel time = 320
20 data items
mean = 320/20 = 16