Answer:
x=-4
Step-by-step explanation:
These two angles have to equal 180 because they are opposite of each other. Therefore, the equation will be 129+x+x+59=180. You add all common terms. 2x+188=180. You want to isolate x so you have to subtract both sides by 188. Therefore, the equation will be 2x=-8. Divide both sides by 2 to isolate x. x=-8/2. This is equal to x=-4.
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Answer:
3 cans
Step-by-step explanation:
A = lw
a = 20 x 8 = 160
a = 40 x 8 = 320 
Together this is 480 
I would need 3 cans.