Please help
Which two railroads participated in the building of the first transcontinental railroad?
A.
the Union Pacific and the Central Pacific
B.
the Union Pacific and the M-K-T
C.
Rock Island and the Central Pacific
D.
the Santa Fe and the Atlantic and Pacific

other sources of text

explanation:

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can we see the cartoon?

explanation:

an oligopoly is a term used to clarify the structure of a particular market, industry, or organization. a market is considered oligopolistic or amazingly focused when it is shared between a few companies.

simplify brackets

8 - 2a - 7 = a + 40

simplify 8 - 2a - 7 to -2a + 1

-2a + 1 = a + 40

add 2a to both sides

1 = a + 40 + 2a

simplify a + 40 + 2a to 3a + 40

1 = 3a + 40

subtract 40 from both sides

1 - 40 = 3a

simplify 1 - 40 o -39

-39 = 3a

divide both sides by 3

-39/3 = a

simplify 39/3 to 13

-13 = a

switch sides

a = -13