Which event marked the start of the nuclear arms race?
a.)soviet union's first test of an atomic bomb in 1949
b.) united states' first test of a hydrogen bomb in 1952
c.) soviet union's launching of sputnik 1 in 1957
d.) cuban missile crisis of 1962

the answer is b. hope this !

"they had a large area of land that they owned."

8 - (2a + 7) = a + 40     distribute/multiply - into (2a + 7)

8 - 2a - 7 = a + 40

1 - 2a = a + 40       add 2a on both sides

1 = 3a + 40         subtract 40 on both sides

-39 = 3a       divide 3 on both sides

-13 = a

[proof]

8 - (2a + 7) = a + 40

8 - (2(-13) + 7) = -13 + 40

8 - (-26 + 7) = 27

8 - (-19) = 27

8 + 19 = 27

27 = 27