Answer:  14 feet 4 inches
Step-by-step explanation:
Given: The length of the first table = 7 feet 7 inches 
The length of the second table = 6 feet 9 inches 
The total length of two tables = 7 feet 7 inches + 6 feet 9 inches 
= (7+6) feet (7+9) inches
=13 feet 16 inches 
Since 1 feet = 12 inches
The total length of two tables = 13 feet+ (12 inches +4 inches)
=13 feet +( 1 feet +4 inches)
= 14 feet 4 inches
Hence, the total length of the two tables =  14 feet 4 inches
 
        
             
        
        
        
Subtract 2b by both sides which gets -b+4=-5 then subtract 4 by both sides so you get -b=-9 and divide -1 by both sides so that b=9
        
                    
             
        
        
        
Answer:
(A) Your friend will save $282.
(B) Your friend will get 23.5% off the original price of the mattress.
Step-by-step explanation:
We first need to find out the price of the mattress after the 15% discount. Our first step is to find what 15% of 1,200 is. We can do this by multiplying the two numbers. 
1,200 x 15% -----> 1,200 x 0.15= 180. 
15% of $1,200 is $180. 
Next subtract $180 from $1,200, which equals $1,020. We can now apply the 10% off internet coupon. 
1,020 x 10% ------> 1,020 x 0.10= 102. 
10% of $1,020 is $102. 
Next we subtract $102 from $1,020 and we get $918, the final price of the discounted mattress. 
We subtract to see how much money the friend saved. 
$1,200 - $918= $282.
We can get the percentage by dividing $282 by $1,200.
282 / 1200= 0.235 decimal form ----> 23.5% 
 
        
             
        
        
        
Answer:
A= −3x+30
A=30 when x=0  which is the y−intercept.
(0,30) is a point on the graph
A=12 when x=6.
Find the slope using the two points 
12-30/6-0= -18/6=-3