Answer:
1. 15a⁵b²+4a⁵b²
= 19a⁵b²
2. -7m-m²+4m²-3m
= -7m -3m -m²+4m²
= -10m +4m²
3. 2pq⁷ and -pq⁷
= (2pq⁷) +(-pq⁷)
= 2pq⁷-pq⁷
= pq⁷
4. -13xy from -5xy
= -5xy - 13xy
= - 18xy
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