21 is the least common denominator of 7 and 3
Answer:
11 ; 13
Step-by-step explanation:
Let the numbers be :
x and x + 2
x * (x + 2) = 6(x + x + 2) - 1
x² + 2x = 6(2x + 2) - 1
x² + 2x = 12x + 12 - 1
x² + 2x = 12x + 11
x² + 2x - 12x - 11 = 0
x² - 10x + 11 = 0
x² - 11x + x + 11 = 0
x(x - 11) + 1(x - 11) = 0
(x - 11) = 0 or (x + 1) = 0
x = 11 or x = - 1
X cannot be negative
x = 11
x + 2 = 11 +2 = 13
Answer:
160,000
Step-by-step explanation:
120,000 + 0.2(120,000)=120,000+24,000=144,000
144,000 were both populations in 2015.
x-0.1x = 144,000
0.9x=144,000
x=160,000
The Population of City Y in 2010 was 160,000
