Which of the following best describes tenements in New York City in the early 1900s? A) crowded and unsanitary apartment buildings where two-thirds of the city's population lived
B) crowded and unsanitary apartment buildings where a small portion of the city's population lived
C) dark and crowded homes outside the city where the majority of city workers lived
D) dark and crowded homes outside the city where immigrants lived for a short time after arriving in America

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)

opinion because one person might not like silk

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