Help me or dont lol but please help me

Combine like terms7y^2 + 7(6y^2 − 8)

Write the expression in complete factored form. 5n_(c - 3) - n(c - 3) =

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