Answer:
Step-by-step explanation 10 + 2.50d = 850 
David starts with $10 and each day he earns $2.50. The d represents a variable and can be any number. 
To find d you must solve the equation. 
 10 + 2.50d = 850
2.50d = 840 (subtract 10 from 850)
d = 336 (divide 840 by 2.50)
It will take David 336 days to save $850.
 
        
             
        
        
        
<span>4(6) + 7 (5 - 3 ) 
= 24 + 7(2)
= 24 + 14
= 38
answer
</span><span>D: 38</span>
        
                    
             
        
        
        
Write the numbers in order first,
4, 6, 8, 9, 11, 12, 13
Middle number in sequence is the median, in this case median is 9.
        
                    
             
        
        
        
G(-2) = 8 + 5(2)
= 8 - 10
= - 2
        
             
        
        
        
Using P.E.M.D.A.S. ( parentheses exponent multiply divide add subtract ) you would multiply the nine into the parentheses