Which expression shows how to write 5/8 - 3/4 using a common denominator

5/8 - 6/8

Step-by-step explanation:

you multiply 3/4 by two to get a common denominator of 8 and you get 6/8

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.