For this case we must propose an algebraic expression associated with:
"four times a difference of a number and seven is 12"
So we have to:
Four times a difference of a number and seven is represented as: 
So we have the expression is:

We apply distributive property to the terms within parentheses:

We add 28 to both sides:

We divide between 4 on both sides:

Answer:

You can just plug in 16 for X
F(16) when F(x)=4x-8
F(x)=4(16)-8
F(x)=64-8
F(x)=56
Answer:
The sale price was $71.2
Step-by-step explanation:
Answer:
There are 21 seats in one row, and there are 147 seats in 7 rows
Step-by-step explanation:
63÷3=21 / 21×7=147
Answer:
14
Add the lengths of all sides together, I would recommend graphing to see for future reference!