Answer:
a ) 7a + 12
b) b - 15
Step-by-step explanation:
a)2a+5a +8+8
= 7a + 12
b) b - 7 - 8 
= b-15
 
        
             
        
        
        
4x+5 = 8x - 11
4x - 8x = -11 - 5
-4x = -16
   x = 4
4x+5 = 4(4) +5 = 21
8x - 11 = 8(4) - 11 = 21
<RST = 21  + 21 = 42
answer
<RST = 42 degrees
        
             
        
        
        
Answer:
$1.65
Step-by-step explanation:
 
        
             
        
        
        
Answer: 1.834 ft
Step-by-step explanation:
Given
Walter's first Jump is 5 ft, 9 in. 
His second Jump is 3 ft, 11 in.
We know, 

Converting inches to feet
First Jump in feet

Second jump

The difference in the measurement of two Jumps is

So, Walter first Jump is 1.834 ft higher than the second Jump
 
        
             
        
        
        
LABC is a 30°angle point B is at (3,2)