I need help plz I have a quiz and idk how to do these

c

Step-by-step explanation:

You have to use pemdas and you should get c

answer: a

step-by-step explanation:

if xy ~ yz therefore xy would be the same length as yz

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.