Answer:
Use the associative property to move the parentheses, and the expression becomes (d + 8d) + 1 + 7. Combine like terms, and the expression becomes 9d +8. Use the commutative property to change the order of the terms, and the expression becomes 8 + 9d.
Step-by-step explanation:
The hand turn 1 quarter of a circle (1/4). it turned 90 degrees
The coordinates at the midpoint of any line are the averages of the coordinates at the end-points. So 7 has to be the average of 10 and k .
(1/2) (10 + k) = 7
5 + k/2 = 7
k/2 = 2
<em>k = 4</em>
12-A
13-C
Hopefully this helps
