Question

I thought x-7 was the right answer because don't you need to subtract? But apparently it was wrong so then which one is the correct answer?​

Answer 1

no you need to add, it would be 7x - 7

Explanation:

You need to look at the line...they gave you the measurement for PR, and the measurement for RS...and they want you to find PS

You need to add because both PR and RS come together to form PS

Answer 2

It is 7x-7

Explanation:

You have to add the two expressions, not subtract them.