What's this question? ? i can't figure it out

Step-by-step explanation:

We can see that the denominators are not the same. You cannot do that when adding or subtracting fractions.

So you must LCD (Least common denominator)

Multiply the denominators to get LCD:

So our denominators are 50.

Now we do crisscross multiplication:

Simplify:

1/2

Step-by-step explanation: To subtract unlike fractions such as 4/5 - 3/10, first we need to find a common denominator. The common denominator of 5 and 10 is simply the least common multiple of 5 and 10 which is 10.

To get 10 in the denominator of 4/5, we multiply the numerator and denominator by 2 to get 8/10. Notice that the second fraction already has 10 in the denominator so we can leave that one alone.

Now, we have our two fractions which are 8/10 and 3/10.

8/10 - 3/10 = 5/10 = 1/2

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign