7/9 = 42/54...when 42/54 reduces, it becomes 7/9...so this is proportional because proportions are nothing but equivalent fractions.
u could also check it this way...
12/21 = 15/24
cross multiply
(21)(15) = (12)(24)
315 = 288.....these do not equal and are therefore, not proportionate
440/4 = 300/3
110 = 100....not equal, so not proportionate
120/5 = 88/4
24 = 22.....not proportionate
66/82 = 99/123
0.804 = 0.804.......these are proportional
68/172 = 43/123
0.395 = 0.349......nope, not proportional
Step-by-step explanation:
the similarity of the triangle:
x/18 = 8/12
=> 12x = 18×8
12x = 144
x = 12
2 7/12
This is because 12/12 is equal to 1/1 or 1. So 12/12 + 12/12 = 2.
2 + 7/12= 2 7/12
Quotient is the result of dividing two numbers.
x= the unknown number
The equation is x divided by 9 equals x minus 40.
x/9= x - 40
multiply both sides by 9
(9)(x/9)= (9)(x - 40)
x= 9x - 360
subtract 9x from both sides
-8x= -360
divide both sides by -8
x= 45
ANSWER: The number is 45.
Hops this helps! :)