4. 19.8
56/4=14
Diagonal of a square is equal to one side multiplied by the square root of two.
Therefore, it is 19.8, being that square root is (in super simple rounding) 1.5.
Answer:

Step-by-step explanation:
Bid of first company:
Bid is
more
of 
Bid of first 
Bid of second company:
Bid of second is
greater than that of first
of first bid 
Hence Bid of second company 
Answer:
(See explanation)
Step-by-step explanation:
The function is:

Its simplified form is presented hereafter:

The resultant expression is a linear function, first-order polynomial, whose domain and range are the set of the real numbers.
They must sell 250 cameras
and 50 more cameras would be a $400 profit