add : 6pq+13qr-5rs,8pq-12qr-23rs and 7pq+8qr+9rs
who will give the corr answer I will mark it as brainliest
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Answer:
21pq + 9qr - 19rs
Step-by-step explanation:
( 6pq + 13qr - 5rs ) + ( 8pq - 12qr - 23rs ) + ( 7pq + 8qr + 9rs)
= 6pq + 13qr - 5rs + 8pq - 12qr - 23rs + 7pq +8qr + 9rs
= (6pq + 8pq + 7pq) + (13qr -12qr +8qr) + (-5rs -23rs + 9rs)
= 21pq + 9qr -19rs
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