It's impossible to give exact answer as you've not attached the image. But I think I can help you by giving some rulles about rotation. 180° rotation is (x;y) change to (-x;-y); 90° counterclockwise (x,y) change to (-y, x); then clockwise <span>90° (x,y), cange to (y, -x). Hope it will help.
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Answer:

Step-by-step explanation:
The formula of a slope:

We have the points

Substitute:

You basically need to set up a porporion:
1.6/2.4 = x/7.2
x=4.8
Answer:
a=0.5b+0.5bh don't know if thats right
Step-by-step explanation:
I am thinking you want me to solve for b1
the equation you gave me=a=1/2(b1+b2)h
1.distruibte
2.solve