The answer is 3x-12y because you combine the like terms so 2x+x=3x and -8y-4y=-12y
Answer:
19.3
Step-by-step explanation:
The ratio would be 6/54
Which reduced would make 1/9
So 1 cm is 9 miles
Step-by-step explanation:

a^2 + 8^2 = 10^2
a^2 =10^2 - 8^2
a^2 =100-64
a^2 =36
(square root it)
a =6