<h3>The expression for the length of fabric used for each doll is

</h3>
<em><u>Solution:</u></em>
Given that,
Margaret has 16 yards of fabric
she is making dresses for z doll
Therefore,
Total length of fabric = 16 yards
Number of dresses = z dolls
Therefore,

Thus, the expression for the length of fabric used for each doll is 
.5x=10+.25x
.25x=10
x=40
When you buy 40 songs
The cost equals 20$
Numbers are 9 and -1
if you add them, you will get 8
if you multiply you will get -9
The answer: Add all the numbers given to you. 9+7+6+6= 28. Divide 28 by the number of intervals (the artists) which is 4. 28 divide 4= 7