10: ac+bc = (a+b)c
7: the sum of the large rectangle is equine to the some of the two smaller rectangles
8: to make sorter and simpler by combining like turns
6: 10x, 5x +5x, 2(x + 5)
9: 2a +3 + a+4, 5x, 6+ 2x+x2+1+x
-0.5
Step-by-step explanation:

slope=

Answer:
/\------------------------------\
a / \ \
/ \ \ (Im not an artist....)
/_____ \________________\
b c
(A x B / 2) + (A x B / 2) + (A x C) + (A x C) + ( B x C) + (B x C)
Step-by-step explanation:
Answer:
730
Step-by-step explanation: