If f(x)=x^2-3x, find f(-18). show work

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

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2

Which equation can be solved to find x the measure of jk in the apex