Answer:



Step-by-step explanation:
Given


Solving (a): (s + t)(x)
This is calculated as:


Collect like terms


Solving (b): (s - t)(x)
This is calculated as:


Collect like terms


Solving (b): (s . t)(1)
First, we calculate (s.t)(x)
This is calculated as:

So, we have:

Substitute 1 for x



Answer: 200 boxes in 5 minutes
Step-by-step explanation:
Trust me :)
Umm, That's A lot Of Homework...
Answer: Area = 5
Step-by-step explanation: