What mistake was made and how can i avoid it next time? if you scam you will be reported

Solve the equation -9p - 17 =10 a -3 b. 16 c. 18 d -16

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest

Hannah paid $3.20 for 16 ounces of potato chips. hank paid $3.23 for 17 ounces of potato chips. who paid less per ounces?