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B
5q
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C
-7r
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D
5q-7r
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Solution
The correct option is D 5q-7r 13(−2p+6q−9r)−16(−4p−18q+24r)=13(−2p+6q−9r)−13(−2p−9q+12r) =13[(−2p+6q−9r)−(−2p−9q+12r)] =13(−2p+6q−9r+2p+9q−12r) =13(15q−21r) =(5q−7r)