5-1= 12+1= 12×2= 50-50=
or
5-1=
12+1=
12×2=
50-50=

Explanation:

They are the same. both equal 0. I dont  know what the question was.

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

b. martin luther king jr. wrote and spoke "i have a dream"

explanation:

i know this 100 percent is correct   b. is the best one. < 3