You can factor it out :)
4x+12=4(x+3)
Step-by-step explanation:
Say you have these 2 fractions

Cross multiply as following;

If in the end, both numerator and denominator are equal, then the fractions are equivalent.
Examples:
Example 1

Cross multiply

They're equivalent.
Example 2

Cross multiply

They're not equivalent.
There are 1,000 grams in a kilogram
Answer:
Ok so lets break it down.
Step-by-step explanation:
5-2 = 3 now we have 1/4 and 1/10 10 divided by 4 = 2.5
So we can convert it then we have 2.5 out of ten.
then we add them up equals 3.5 out of ten.
Now we have 3.3.5 So now all we do is have to add 2.