Answer:
17. 11x - 11y  or  11x + (-11y)
18. -7.52 - 2.8  or  -7.52 + (-2.8)
19. 41x - 21y - 6
20. -3y -8xy
Step-by-step explanation:
17. Use the distributive property. 
18. Use the distributive property to multiply each number inside the parentheses by 0.4
19. Multiply each number inside the parenthese by 7.
20.Multiply each term in parenthese by y.
 
        
             
        
        
        
Answer:
the amount of a $3,000.00 annuity due at 12 percent compounded semiannually for 3 years. A. $334,321.00 B. $43,068.93 C. $22,180.50 D. $41,814.50
 
        
             
        
        
        
Solution:
<u>We know that:</u>



<u>Simplify the equation to find the percent off:</u>

![84\% + \bold{16\%} = 100\% \space\ \space\ \space\ \ \ \ \ [Rounded]](https://tex.z-dn.net/?f=84%5C%25%20%2B%20%5Cbold%7B16%5C%25%7D%20%3D%20100%5C%25%20%5Cspace%5C%20%5Cspace%5C%20%5Cspace%5C%20%5C%20%5C%20%5C%20%5C%20%5BRounded%5D)
This means that the <u>original price</u> has decreased about 16%.
 
        
             
        
        
        
Answer:
3.17x10^-3
Step-by-step explanation:
Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the  
10. If the decimal is being moved to the right, the exponent will be negative. If the decimal is being moved to the left, the exponent will be positive.
 
        
             
        
        
        
9w - 7 = 5
9w= 5+7
9w=12
w= 4/3 or 1.33