The vertex of f(x)= - (x+2)-7

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

Find the value of x. give reasons to justify your solutions! l, m ∈ kn

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?