If anyone can answer this question... thank you so much!
topic- Algebriac Expressions!

Step-by-step explanation:

In addition , sign of each term in the expression remains unchanged. Just remove the unnecessary parentheses.

Collect like terms and simplify

Like terms are those which have the same base.

While subtracting, sign of each term of the second expression changes.

Now, Rewrite the expression in standard form. That means , You have to arrange the terms having greatest power to lowest.

Hope I helped!

Best regards! :D

~

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.

answer: x=3 and y=4

step-by-step explanation: