What would be the answer?

For each proportion find the unknown number x 1/5/8=×/15

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

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12